1 / 31

VIRUSES CHAPTER 18

VIRUSES CHAPTER 18. Part 1. Characteristics. T-4 Virus - infects E. coli. non-living particles invade living cells pathogenic - named after the disease they cause or organ they infect smallest of all organisms. VIRUS - an obligate intracellular parasite. INFECTIOUS MONONUCLEOSIS.

barbra
Download Presentation

VIRUSES CHAPTER 18

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. VIRUSESCHAPTER 18 Part 1

  2. Characteristics T-4 Virus - infects E. coli • non-living particles • invade living cells • pathogenic - named after the disease they cause or organ they infect • smallest of all organisms

  3. VIRUS - an obligate intracellular parasite INFECTIOUS MONONUCLEOSIS

  4. Origin of Viruses Wendell Stanley (1904 - 1971) first isolated TMV in 1935. • Viruses may have originated from host cells • 1935 - first seen by an electron microscope • Tobacco mosaic virus - first virus discovered - 1886

  5. 1886 - “Living Fluid Infectant” - the virus passed through filters that held bacteria.

  6. Viral Structure • Inner core - contains viral DNA or RNA (never both) • Capsid - outer coat of protein • Envelope - outer layer on larger viruses

  7. Various Shapes of Viruses

  8. Viral ReplicationLytic Cycle • 1. Attachment • 2. Injection • 3. Replication • 4. Assembly • 5. Lysis

  9. LYSOGENIC CYCLE 1. Attachment 2. Injection • Viral DNA integration (provirus) 4. Cell division 5. Replication 6. Assembly 7. Lysis

  10. L Y S O G E N I C L Y T I C

  11. VIRUSESCHAPTER 18 Part 2

  12. Edward Jenner - discovered a vaccine for smallpox

  13. SmallpoxVariola (Major & Minor) • First virus to be studied in detail • Edward Jenner - 1798 • First vaccine - cowpox virus (vaccinia virus)

  14. Child with smallpox

  15. Last case of smallpox (Ali Maow of Merka, Somalia, contracted smallpox in 1977 at the age of 23. His was the last known case of smallpox in the world.)

  16. Icosahedral Virus(many sides) Wart virus Polio - Naked, small, icosahedral virus

  17. Enveloped Virus INFLUENZA VIRUS

  18. Children with measles (uncommon today)

  19. BACTERIOPHAGE E-Coli Bacteria

  20. Attachment of a phage to the cell wall of E-Coli

  21. Temperate vs. Virulent Viruses

  22. HERPES ZOSTER (“Shingles”)

  23. HERPESVIRUS HERPES

  24. Retroviruses HIV • RNA viruses • Reverse transcriptase - makes DNA from its RNA • Includes HIV, polio & some cancers

  25. Retrovirus Cycle

  26. HIV /AIDS

  27. Louis Pasteur -discovered a vaccine for rabies

  28. PATHWAY OF RABIES VIRUS

  29. Animal Rabies in U. S.1999

More Related