Your SlideShare is downloading. ×
0
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
06 viruses
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

06 viruses

1,163

Published on

Published in: Health & Medicine, Technology
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,163
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
78
Comments
0
Likes
2
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide
  • http://www.youtube.com/watch?v=Rpj0emEGShQ How the flu virus invades your body
  • Which Human Diseases Are Caused By Viruses? Viruses cause diseases in the many organisms that they infect. This slide lists some of the more well-known infectious diseases of humans caused by DNA and RNA viruses. Viruses also cause significant problems in animals and plants. Some viruses, referred to as “tumor viruses,” also can cause cancer. The cancer-causing abilities of some tumor viruses have been demonstrated only in animals. However, there is growing evidence that certain viruses cause specific types of human cancers. For example, some types of papillomavirus, a DNA virus, have been identified as a cause of cervical cancer. HTLV-1, a retrovirus, causes a type of adult leukemia. References: Campbell, N.E., & Reece, J.B. (2002). Biology (6th ed.). San Francisco: Benjamin Cummings. Flint, S.J., Enquist, L.W., Krug, R.M., Racaniello, V.R., and Skalka, A.M. (2000). Principles of Virology: Molecular Biology, Pathogenesis, and Control . ASM Press.
  • http://www.youtube.com/watch?v=9leO28ydyfU How HIV infects http://www.youtube.com/watch?v=8Csh94TGySQ&feature=related how reverse transcriptase can make mistakes but help HIV survive http://www.youtube.com/watch?v=1Ah8lZ4sZFw&feature=related Resistance to HIV
  • Transcript

    • 1. VIRUSES
    • 2. VIRUSES Avian influenza AH5N1 virus
    • 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. 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. VIRUSES Multiple virions of yellow fever virus, the first human virus discovered in 1901.
    • 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. VIRUSES SARS related Corona viruses
    • 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. 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. <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. 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. <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. <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. Electron Micrograph of HIV Budding from a T4-Lymphocyte Virus Obtaining Its Envelope from Host Cell Membrane by Budding VIRAL STRUCTURE
    • 15. Chicken Pox varicella-zoster  virus (VZV) DNA Virus
    • 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. 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. Genital Warts HPV – human papillomavirus DNA Virus GARDASIL VACCINE
    • 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>

    ×