VIRUSES
VIRUSES Avian influenza AH5N1 virus
Virus Definition & Criteria <ul><li>infectious agent with both living and nonliving characteristics  that is totally depen...
Virus Definition & Criteria <ul><li>newly synthesized viral components are assembled into a new complete virus called a  v...
VIRUSES Multiple virions of  yellow fever virus, the first human virus discovered in 1901.
<ul><li>Living characteristics of viruses  </li></ul><ul><li>reproduce  at a fast  rate, but only in living host cells </l...
VIRUSES SARS related  Corona viruses
Viral Size Viruses are usually much smaller than bacteria and are submicroscopic. Most range in size from 5 to 300 nm .  T...
Viral Structure <ul><li>A virus consists of these main parts: </li></ul><ul><li>Genome (DNA/RNA) </li></ul><ul><li>Capsid ...
<ul><li>G enome </li></ul><ul><li>Genetic material of the virus that codes for the synthesis of viral components and viral...
Which Human Diseases Are Caused By Viruses? <ul><li>Infectious diseases   </li></ul><ul><ul><li>DNA viruses </li></ul></ul...
<ul><li>C apsid  (core) </li></ul><ul><li>A  protein shell surrounding the genome.  </li></ul><ul><li>P rotect s  and intr...
<ul><li>E nvelope  </li></ul><ul><li>Most animal viruses have an envelope  </li></ul><ul><li>C omposed of phospholipids an...
Electron Micrograph of HIV Budding from a T4-Lymphocyte Virus Obtaining Its Envelope from Host Cell Membrane by Budding VI...
Chicken Pox varicella-zoster  virus (VZV) DNA Virus
Polio Poliovirus RNA Virus  It is found in areas where water treatment and sanitation facilities are not properly maintain...
Herpes DNA Virus Herpes Simplex 1 and herpes simplex 2. The sores are sometimes accompanied by other symptoms such as: hea...
Genital Warts HPV – human papillomavirus DNA Virus GARDASIL  VACCINE
HIV – Human Immunodeficiency Virus  HIV MYTHS <ul><li>http://www.youtube.com/watch?v=LaVm3moZo_g </li></ul><ul><li>http://...
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06 viruses

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06 viruses

  1. 1. VIRUSES
  2. 2. VIRUSES Avian influenza AH5N1 virus
  3. 3. Virus Definition & Criteria <ul><li>infectious agent with both living and nonliving characteristics that is totally dependent on a host cell for replication (intracellular parasite) </li></ul><ul><li>contain only either DNA or RNA, but not both </li></ul><ul><li>viral genome directs the synthesis of viral components using host cell machinery </li></ul>VIRUSES
  4. 4. Virus Definition & Criteria <ul><li>newly synthesized viral components are assembled into a new complete virus called a virion ( pronounced vye-ree-on ) which can then infect another host cell </li></ul><ul><li>b acteriophage : virus that infects only bacteria </li></ul><ul><li>mycophage: virus that infect s only fungi </li></ul>VIRUSES
  5. 5. VIRUSES Multiple virions of yellow fever virus, the first human virus discovered in 1901.
  6. 6. <ul><li>Living characteristics of viruses </li></ul><ul><li>reproduce at a fast rate, but only in living host cells </li></ul><ul><li>can mutate / evolve </li></ul><ul><li>Nonliving characteristics of viruses </li></ul><ul><li>are acellular ( no cytoplasm or organelles ) </li></ul><ul><li>not autonomous: carry out no metabolism on their own (i.e. viruses don't grow and divide ) </li></ul><ul><li>replication is fully dependent on the host cell's metabolic machinery ; viral components are synthesized and assembled within the infected host cell </li></ul>VIRUSES
  7. 7. VIRUSES SARS related Corona viruses
  8. 8. Viral Size Viruses are usually much smaller than bacteria and are submicroscopic. Most range in size from 5 to 300 nm . Thus viruses can infect even other microorganisms. Animal RNA Virus Animal DNA Virus Bacteriophage
  9. 9. Viral Structure <ul><li>A virus consists of these main parts: </li></ul><ul><li>Genome (DNA/RNA) </li></ul><ul><li>Capsid (protein) </li></ul><ul><li>Envelope (lipid) </li></ul>capsid genome VIRUSES
  10. 10. <ul><li>G enome </li></ul><ul><li>Genetic material of the virus that codes for the synthesis of viral components and viral enzymes for replication </li></ul><ul><li>Can be DNA or RNA but not both </li></ul><ul><li>Can be single or double stranded </li></ul><ul><li>Can be a circular or linear molecule </li></ul><ul><li>Can be a single unit or segmented into parts </li></ul>VIRUSES
  11. 11. Which Human Diseases Are Caused By Viruses? <ul><li>Infectious diseases </li></ul><ul><ul><li>DNA viruses </li></ul></ul><ul><ul><ul><li>Respiratory disease </li></ul></ul></ul><ul><ul><ul><li>Smallpox </li></ul></ul></ul><ul><ul><ul><li>Chicken pox </li></ul></ul></ul><ul><ul><ul><li>Mononucleosis </li></ul></ul></ul><ul><ul><ul><li>Cold sores </li></ul></ul></ul><ul><li>RNA viruses </li></ul><ul><ul><li>AIDS </li></ul></ul><ul><ul><li>Influenza (flu) </li></ul></ul><ul><ul><li>Common cold </li></ul></ul><ul><ul><li>Polio </li></ul></ul><ul><ul><li>Measles </li></ul></ul><ul><ul><li>Rabies </li></ul></ul>VIRUSES
  12. 12. <ul><li>C apsid (core) </li></ul><ul><li>A protein shell surrounding the genome. </li></ul><ul><li>P rotect s and introduce s the genome into host cells. </li></ul><ul><li>V iruses that consist of only a genome surrounded by a capsid and are called nucleocapsid or naked viruses. </li></ul>VIRAL STRUCTURE Nucleic acid Envelope Capsid
  13. 13. <ul><li>E nvelope </li></ul><ul><li>Most animal viruses have an envelope </li></ul><ul><li>C omposed of phospholipids and glycoprotein </li></ul><ul><li>Usually derived from host cell membranes by a proces s called buddin g. </li></ul>VIRAL STRUCTURE Nucleic acid Envelope Capsid
  14. 14. Electron Micrograph of HIV Budding from a T4-Lymphocyte Virus Obtaining Its Envelope from Host Cell Membrane by Budding VIRAL STRUCTURE
  15. 15. Chicken Pox varicella-zoster  virus (VZV) DNA Virus
  16. 16. Polio Poliovirus RNA Virus It is found in areas where water treatment and sanitation facilities are not properly maintained or non-existent. Although children under three years of age represent more than half of all cases polio can affect people of any age. Nonparalytic polio causes symptoms that mimic the flu. Sore throat, fatigue, nausea, diarrhea, a fever, or vomiting. Most cases of nonparalytic polio clear up in a number of days, but a some people go on to develop meningitis, a condition in which the lining of the brain is infected. When a person develops paralytic polio, destroys nerves that control muscles. The infection may be fatal if the brain and respiratory organs become affected. Polio is a serious condition that causes paralysis in about 1% of those infected (paralytic polio).
  17. 17. Herpes DNA Virus Herpes Simplex 1 and herpes simplex 2. The sores are sometimes accompanied by other symptoms such as: headache, fever, and other flu-like symptoms pain, itching, tingling, or tenderness around the genitals painful urination, swollen tender points in the groin and lower abdomen
  18. 18. Genital Warts HPV – human papillomavirus DNA Virus GARDASIL VACCINE
  19. 19. HIV – Human Immunodeficiency Virus HIV MYTHS <ul><li>http://www.youtube.com/watch?v=LaVm3moZo_g </li></ul><ul><li>http://www.youtube.com/watch?v=68I7JlVhuhY&feature=related </li></ul>

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