herpes simplex virus is a double stranded DNA virus causing many symptoms all over the body. it affects globally all over the world .
neonatal hsv attacks even the baby and made them to a fatal conditions.
The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and over time acquired immunodeficiency syndrome (AIDS).
A picornavirus is a virus belonging to the family Picornaviridae, a family of viruses in the order Picornavirales. Vertebrates, including humans, serve as natural hosts. Picornaviruses are nonenveloped viruses that represent a large family of small, cytoplasmic, plus-strand RNA viruses with a 30-nm icosahedral capsid.
A LECTURE ON AIDS FOR FIRST MBBS STUDENTS, DEPT OF BIOCHEMISTRY.
A CLASS ON EPIDEMIOLOGY, VIROLOGY,HIV-MORPHOLOGY, GENOME, LIFE CYCLE,MODE OF TRANSMISSION, IMMUNOLOGY, PATHOPHYSIOLOGY AND PATHOGENESIS, LABORATORY DIAGNOSIS AND MANAGEMENT.
herpes simplex virus is a double stranded DNA virus causing many symptoms all over the body. it affects globally all over the world .
neonatal hsv attacks even the baby and made them to a fatal conditions.
The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and over time acquired immunodeficiency syndrome (AIDS).
A picornavirus is a virus belonging to the family Picornaviridae, a family of viruses in the order Picornavirales. Vertebrates, including humans, serve as natural hosts. Picornaviruses are nonenveloped viruses that represent a large family of small, cytoplasmic, plus-strand RNA viruses with a 30-nm icosahedral capsid.
A LECTURE ON AIDS FOR FIRST MBBS STUDENTS, DEPT OF BIOCHEMISTRY.
A CLASS ON EPIDEMIOLOGY, VIROLOGY,HIV-MORPHOLOGY, GENOME, LIFE CYCLE,MODE OF TRANSMISSION, IMMUNOLOGY, PATHOPHYSIOLOGY AND PATHOGENESIS, LABORATORY DIAGNOSIS AND MANAGEMENT.
Polio: flaccid paralysis, major and minor
disease, fecal-oral
Coxsackievirus A: vesicular diseases,
meningitis; coxsackievirus B (body):
pleurodynia, myocarditis
Other echovirus and enteroviruses: like
coxsackievirus
Rhinoviruses: common cold, acid labile, does
not replicate above 33° C
Biology, Virulence, and Disease
• Small size, icosahedral capsid, positive RNA
genome with terminal protein
• Genome is sufficient for infection
• Encodes RNA-dependent RNA polymerase,
replicates in cytoplasm
Enteroviruses
• Capsid virus resistant to inactivation
• Disease due to lytic infection of important
target tissue
• Polio: cytolytic infection of motor neurons of
anterior horn and brainstem, paralysis
• Coxsackievirus A: herpangina, hand-foot-
and-mouth disease, common cold,
meningitis
• Coxsackievirus B: pleurodynia, neonatal
myocarditis, type 1 diabetes
Rhinoviruses
• Acid labile and cannot replicate at body
temperature
• Restricted to upper respiratory tract
• Common cold
Epidemiology
• Enteroviruses transmitted by fecal-oral route
and aerosols
• Rhinoviruses transmitted by aerosols and
contact
Diagnosis
• Immune assays (ELISA) or RT-PCR genome
analysis of blood, CSF, or other relevant
sample
Treatment, Prevention, and Control
• OPV and IPV polio vaccines
P
icornaviridae is one of the largest families of viruses and
includes some of the most important human and animal
viruses (Box 46-1). As the name indicates, these viruses are
small (pico) ribonucleic acid (RNA) viruses that have a
naked capsid structure. The family has more than 230
members divided into nine genera, including Enterovirus,
Rhinovirus, Hepatovirus (hepatitis A virus; discussed in
Chapter 55), Cardiovirus, and Aphthovirus. The enterovi-
ruses are distinguished from the rhinoviruses by the stabil-
ity of the capsid at pH 3, the optimum temperature
for growth, the mode of transmission, and their diseases
Adenoviridae is a group of medium sized, non-enveloped, double stranded DNA viruses that replicate and produce disease in the eye and in the respiratory, gastrointestinal and urinary tracts;
Rubella (German measles) is a disease caused by the rubella virus. Rubella is usually a mild illness. Most people who have had rubella or the vaccine are protected against the virus for the rest of their life. Because of routine vaccination against rubella since 1970 , rubella is now rarely reported.
Polio: flaccid paralysis, major and minor
disease, fecal-oral
Coxsackievirus A: vesicular diseases,
meningitis; coxsackievirus B (body):
pleurodynia, myocarditis
Other echovirus and enteroviruses: like
coxsackievirus
Rhinoviruses: common cold, acid labile, does
not replicate above 33° C
Biology, Virulence, and Disease
• Small size, icosahedral capsid, positive RNA
genome with terminal protein
• Genome is sufficient for infection
• Encodes RNA-dependent RNA polymerase,
replicates in cytoplasm
Enteroviruses
• Capsid virus resistant to inactivation
• Disease due to lytic infection of important
target tissue
• Polio: cytolytic infection of motor neurons of
anterior horn and brainstem, paralysis
• Coxsackievirus A: herpangina, hand-foot-
and-mouth disease, common cold,
meningitis
• Coxsackievirus B: pleurodynia, neonatal
myocarditis, type 1 diabetes
Rhinoviruses
• Acid labile and cannot replicate at body
temperature
• Restricted to upper respiratory tract
• Common cold
Epidemiology
• Enteroviruses transmitted by fecal-oral route
and aerosols
• Rhinoviruses transmitted by aerosols and
contact
Diagnosis
• Immune assays (ELISA) or RT-PCR genome
analysis of blood, CSF, or other relevant
sample
Treatment, Prevention, and Control
• OPV and IPV polio vaccines
P
icornaviridae is one of the largest families of viruses and
includes some of the most important human and animal
viruses (Box 46-1). As the name indicates, these viruses are
small (pico) ribonucleic acid (RNA) viruses that have a
naked capsid structure. The family has more than 230
members divided into nine genera, including Enterovirus,
Rhinovirus, Hepatovirus (hepatitis A virus; discussed in
Chapter 55), Cardiovirus, and Aphthovirus. The enterovi-
ruses are distinguished from the rhinoviruses by the stabil-
ity of the capsid at pH 3, the optimum temperature
for growth, the mode of transmission, and their diseases
Adenoviridae is a group of medium sized, non-enveloped, double stranded DNA viruses that replicate and produce disease in the eye and in the respiratory, gastrointestinal and urinary tracts;
Rubella (German measles) is a disease caused by the rubella virus. Rubella is usually a mild illness. Most people who have had rubella or the vaccine are protected against the virus for the rest of their life. Because of routine vaccination against rubella since 1970 , rubella is now rarely reported.
A detailed description of HIV covering virology, morphology, pathogenesis, clinical stages and manifestations, laboratory diagnosis, and diagnostic strategy, and therapeutic options and prevention.
It contain all information like introduction,stages,life cycle,treatment , laboratory diagnosis and first people on earth who cured from the infection with HIV.
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
HOT NEW PRODUCT! BIG SALES FAST SHIPPING NOW FROM CHINA!! EU KU DB BK substit...GL Anaacs
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We specializes in exporting high quality Research chemical, medical intermediate, Pharmaceutical chemicals and so on. Products are exported to USA, Canada, France, Korea, Japan,Russia, Southeast Asia and other countries.
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
Anti ulcer drugs and their Advance pharmacology ||
Anti-ulcer drugs are medications used to prevent and treat ulcers in the stomach and upper part of the small intestine (duodenal ulcers). These ulcers are often caused by an imbalance between stomach acid and the mucosal lining, which protects the stomach lining.
||Scope: Overview of various classes of anti-ulcer drugs, their mechanisms of action, indications, side effects, and clinical considerations.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
2. Introduction
Etiologic agent of Acquired Immunodeficiency Syndrome
(AIDS).
Discovered independently by Luc Montagnier of France and
Robert Gallo of the US in 1983.
Former names of the virus include:
Lymphadenopathy associated virus (LAV) (Luc Montagnier)
Human T cell lymphotrophic virus (HTLV-III) (Robert Gallo)
AIDS associated retrovirus (ARV)
1986, HIV name was given by International Committee on Virus
Nomenclature.2
3. Introduction
HIV-2 discovered in 1986, antigenically distinct virus
endemic in West Africa.
30 million worldwide are infected. 2 million deaths
every year & 2.5 million new cases every year.
Leading cause of death of men aged 25-44 and 4th
leading cause of death of women in this age group.
HIV-1 in humans was believed to be acquired from
chimpanzee (Pan troglodytes troglodytes) by cross species
infections (simian immunodeficiency virus or SIVcpz).
HIV-2 through sooty mangabeys.3
4. Characteristics of the virus
Icosahedral (20 sided), enveloped virus of
the lentivirus subfamily of retroviruses.
Retroviruses transcribe RNA to DNA.
Two viral strands of RNA found in core
surrounded by protein outer coat.
Outer envelope contains a lipid matrix within
which specific viral glycoproteins are
imbedded.
These knob-like structures responsible for
binding to target cell.4
5. HIV
The outer shell of the virus is known as the
Viral enevlope. Embedded in the viral
envelope is a complex protein known as env
which consists of an outer protruding cap
glycoprotein (gp) 120, and gp 41.
Within the viral envelope is an HIV protein
called p17(matrix), and within this is the
viral core or capsid, which is made of
another viral protein p24(core antigen).
5
7. Group Specific Antigen (Gag)
It encodes for core and shell proteins.
Expressed as a precursor protein, p55.
Cleaved into p15, p17 and p24.
p 24 can be detected in serum during early
stages of infection till the appearance of
antibodies.
The decline of anti-p24 antibody from
circulation indicates progression of illness and
is an indication of antiviral treatment7
8. Envelope (Env)
Envelope (Env) gene codes for envelope
protein gp160; gp120 and gp41.
gp160 cleaved to form gp120 and gp41.
gp120 forms the 72 knobs which protrude from
outer envelope.
gp41 is a transmembrane glycoprotein
antigen that spans the inner and outer
membranes and attaches to gp120.
gp120 and gp 41 both involved with fusion and
attachment of HIV to CD4 antigen on host cells.
8
9. Polymerase (Pol)
Polymerase (Pol) codes for viral enzymes
such as reverse transcriptase.
Expressed as precursor protein p100.
Cleaved into p 31, p 51 and p 64.
Located in the core, close to nucleic acids.
Responsible for conversion of viral RNA
into DNA, integration of DNA into host cell
DNA and cleavage of protein precursors.
9
10. Sexual transmission, presence of
STD increases likelihood of
transmission.
Blood transfusion.
Parenteral transmission.
Exposure to infected blood or blood
products.
Transplantation of infected tissues
or organs.
Mother to fetus, perinatal
transmission variable.10
Modes of transmission
12. Types of Exposure and Relative Risk
S.N. Types of Exposure Relative risk per
exposure (%)
1. Sexual intercourse: anal, vaginal, oral 0.1-1.0
2. Transfusion of blood and blood products >90
3. Tissue and organ donations 50-90
4. Injection and injuries 0.5-1.0
5. Mother to baby 30
12
13. Viral Replication
First step, HIV attaches to susceptible
host cell.
Site of attachment is the CD4 antigen found
on a variety of cells
helper T cells
macrophages
monocytes
B cells
microglial brain cells
T cells infected later on.13
14. Early Phase HIV Infection
In early phase HIV infection, initial viruses
are M-tropic. Their envelope glycoprotein
gp120 is able to bind to CD4 molecules and
chemokine receptors called CCR5 found on
macrophages.
Mutation of CCR5 in some Europeans are
Completely resistant to HIV infection if the
mutation is homozygous or are susceptible
but progress of AIDS is delayed if the
mutation is heterozygous.
14
Maraviroc
15. In late phase HIV infection, most of the
viruses are T-tropic, having gp120
capable of binding to CD4 and CXCR4
found on T-lymphocytes.
15 HIV (arrows) Infecting a T-lymphocyte
16. Life Cycle
HIV attaches to two cell-
surface receptors (the CD4
antigen and a specific
chemokine receptor).
The virus and cell membrane
fuse, and the virion core enters
the cell.
The viral RNA and core
proteins are released from the
virion core and are then
actively transported to the
nucleus.
16
17. The viral RNA genome is
converted into double-
stranded DNA through an
enzyme unique to viruses,
reverse transcriptase.
The double-stranded viral
DNA moves into the cell
nucleus.
Using a unique viral
enzyme called integrase,
the viral DNA is
integrated into the cellular
DNA. The integrated
virus is called provirus.
17
18. 18
Viral RNA is synthesized by
the cellular enzyme RNA
polymerase using
integrated viral DNA as a
template.
Two types of RNA
transcripts shorter spliced
RNA and full-length
genomic RNA are produced.
Shorter spliced RNAs are
transported to the cytoplasm
and used for the production
of several viral proteins that
are then modified in the
ribosomes of the cell.
19. Full-length
genomic RNAs are
transported to the
cytoplasm.
New virion is
assembled and then
buds off.
Mature virus is
released.
19
Enfuvirtide
Indinavir,
Ritonavir,
Darunavir
Raltigravir
Zidovudine
(NRTI)
20. Viral Replication
The gp120 protein on virus binds
specifically to CD4 receptor on host cell
with high affinity.
gp41 causes fusion of the virus to the cell
membrane.
After fusion virus particle enters cell.
Viral genome exposed by uncoating
particle.
Reverse transcriptase produces viral
DNA from RNA.
Becomes a provirus which integrates into
host DNA.
Period of latency occurs.20
21. Viral Replication
After a period of latency lasting up to
10 years viral replication is triggered and
occurs at high rate.
CD4 cell may be destroyed in the
process, body attempts to replace lost
CD4 cells, but over the course of many
years body is unable to keep the count at
a safe level.
Destruction of large numbers of CD4
cause symptoms of HIV to appear with
increased susceptibility to opportunistic
infections, disease and malignancy.
21
22. Clinical Features: According to CDC, clinical course of
HIV infection
Group I- Acute HIV infection: Acute onset of fever, malaise, sore throat, myalgia,
arthralgia, skin rash and lymphadenopathy. Viral nucleic acid or viral p24 antigen
may be detected. Antibodies to HIV usually negative. (3 to 6 months)
Group II- Asymptomatic infection: Show positive HIV antibody tests and are
infectious. Person usually well.
Group III- Persistent generalised lymphadenopathy: Enlarged nodes at two or
more extragenital sites for at least 3 months.
Group IV- Symptomatic HIV infection: CD4 T lymphocyte count falls below
400 per cu. mm. Symptoms like diarrhea, fever, weight loss, night sweats and
opportunistic infection develops. Some patients develops AIDS related complex or
conditions.
22
23. Primary HIV Syndrome
Cold or flu-like symptoms may occur 6 to 12 weeks after infection.
Symptoms are relatively nonspecific.
HIV antibody test often negative but becomes positive within 3 to 6
months (window period), this process is known as seroconversion.
Large amount of HIV in the peripheral blood.
Primary HIV syndrome resolves itself and HIV infected person
remains asymptomatic for a prolonged period of time, often years
(Clinical Latency).23
24. Clinical Latency Period
HIV continues to reproduce, CD4 count
gradually declines from its normal value
of 500-1200.
Once CD4 count drops below 500, HIV
infected person at risk for opportunistic
infections.
The following diseases are predictive of
the progression to AIDS:
Persistent Herpes-zoster infection
Oral candidiasis (thrush)
Oral hairy leukoplakia (Epstein Barr virus)
Kaposi’s sarcoma (KS) (Herpes Virus)24
Candidiasis
Oral Hairy Leukoplakia
25. Oral Hairy Leukoplakia (OHL)
Being that HIV reduces immunologic activity, the
intraoral environment is a prime target for chronic
secondary infections and inflammatory processes,
including OHL, which is due to the Epstein-Barr virus
under immunosuppressed conditions .
25
Kaposi’s sarcoma (KS)
Kaposi’s sarcoma is a rare cancer of the blood
vessels that is associated with HIV caused due to
Herpes virus. It manifests as bluish-red oval-shaped
patches that may eventually become thickened.
Lesions may appear singly or in clusters.
OHL
Kaposi’s sarcoma
26. AIDS
CD4 count drops below 200, person is considered to have advanced HIV disease
If preventative medications not started the HIV infected person is now at risk for:
a. Pneumocystis carinii pneumonia (PCP)
b. Cryptococcal meningitis
c. Toxoplasmosis
If CD4 count drops below 50:
a. Mycobacterium tuberculosis
b. Cytomegalovirus
c. Lymphoma
d. Dementia
e. Most deaths occur with CD4 counts below 50.
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28. ‘Typical’ HIV-1 infection
symptoms
HIV-1 p24 antigen
0 1 2 3 4 5 6 / 2 4 6 8 10
weeks years
HIV antibodies
Time following infection
HIV viral load
HIV proviral DNA
symptoms
‘window’
period
1° infection
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29. Immunologic Manifestations
Immune abnormalities associated with increased viral replication.
Decrease in CD4 cells due to virus budding from cells, fusion of uninfected cells
with virally infected cells and apoptosis.
B cells have decreased response to antigens possibly due to blockage of T cell/B
cell interaction by binding of viral proteins to CD4 site.
CD8 cells initially increase and may remain elevated.
As HIV infection progresses, CD4 T cells drop resulting in immunosuppression
and susceptibility of patient to opportunistic infections.
Death comes due to immuno-incompetence.29
30. Laboratory Diagnosis of HIV Infection
Methods utilized to
detect:
Antibody
Antigen
Viral nucleic acid
Virus in culture
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Screening tests
ELISA
Rapid test
HIV spot and comb tests
Supplemental tests:
Western blot test
Indirect immunofluorescence test
Radio Immuno assay
PCR
31. ELISA Testing
Antibodies detected in ELISA include those directed against: p24, gp120, gp160
and gp 41, detected first in infection and appear in most individuals.
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Other Screening Tests
Agglutination tests using latex particles, gelatin particles or microbeads are
coated with HIV antigen and will agglutinate in the presence of antibody.
Dot-Blot Testing utilizes paper or nitrocellulose impregnated with antigen,
patient serum is filtered through, and anti-antibody is added with enzyme
label, color change is positive.
A rapid, cost-effective and may become an alternative to standard ELISA
and Western blot testing.
32. Western Blot
Most popular confirmatory test.
Antibodies to p24 and p55 appear
earliest but decrease or become
undetectable.
Antibodies to gp31, gp41, gp 120,
and gp160 appear later but are
present throughout all stages of the
disease.
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Interpretation of results.
No bands, negative.
In order to be interpreted as positive a minimum of 3 bands directed against the
following antigens must be present: p24, p31, gp41 or gp120/160.
CDC criteria require 2 bands of the following: p24, gp41 or gp120/160.
33. Detection of p24 HIV antigen
Most useful for the following:
early infection suspected in seronegative patient
Newborns
Monitoring disease progress
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Polymerase Chain Reaction (PCR)
Looks for HIV DNA in the WBCs of a person.
PCR amplifies tiny quantities of the HIV DNA present, each cycle of PCR
results in doubling of the DNA sequences present.
34. Virus isolation
Virus isolation can be used to definitively diagnose
HIV.
Best sample is peripheral blood, but can use CSF,
saliva, cervical secretions, semen, tears or material
from organ biopsy.
Cell {peripheral blood mononuclear cell (PBMC)}
growth in culture is stimulated, amplifies number of
cells releasing virus.
Cultures incubated one month, infection confirmed
by detecting reverse transcriptase or p24 antigen in
supernatant.
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35. Resistance:
Temperature: Inactivated at 56o
C in 30 minutes and in seconds at 100o
C.
Disinfection:
35% Isopropyl alcohol: inactivation in 10 minutes.
70% ethanol
0.5% lysol
2% freshly prepared glutaraldehyde
0.5% sodium hypochlrite
3% hydrogen peroxide
Extremes of pH (pH 1.0, pH 13.0)
Resistant to Lyophilisation
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