1. Intro to Viruses.avi

2. NNon-living particles CCan only reproduce by infecting living (host) cells GGenome is made of either DNA or RNA TToo small to be seen with any light microscope (need 7,000x magnification; light microscopes can only magnify ~1,000x)

3.  RNA or DNA genome  DNA/RNA surrounded by a protein coat (capsid)  Many different shapes Virus Size & Shape

4.  Virus that infects bacteria  (A germ that infects another germ)  “Bacteria eater” T4 Bacteriophage

5.  Viruses can only reproduce by infecting a HOST cell Flu Attack! How A Virus Invades Your Body Viral Infection & Spread

6.  In a lytic infection, the virus enters the cell, makes copies of itself, & causes the cell to burst Outlaw eliminates town’s authority Virus destroys host cell’s DNA Outlaw demands equipment & to be armed Virus uses the host cell to make new virus parts Outlaw forms a new gang & moves on to a new town Host cell bursts, releasing hundreds of virus particles

7.  In a lysogenic infection, virus DNA combines with host DNA and is replicated along with it; the host cell lives…but is infected…and can become lytic later…

8.  Despite many similar characteristics, viruses are not living Living Non-Living

9.  Influenza  Airborne & direct contact  Common cold (rhinovirus)  Airborne & direct contact  HIV (Human Immunodeficiency Virus)  Blood & sexual contact  Chicken Pox  Airborne, direct contact & direct contact with lesions  HPV (Human Papillomavirus)  Sexual contact  Smallpox  Airborne & direct contact  Polio  Fecal-oral route Google Flu TrendHIV 3D illustrationPolio Vaccine Smallpox & Vaccine 2