` host is a WBC called a T-cell
HIV needs to connect to TWO protein types on the outside of the Immune System’s Helper T Cells
HIV needs to connect to TWO protein types on the outside of the Immune System’s Helper T Cells (WBC)
LAST KIND DNA
DNA Viruses 1.Insert their DNA into host/ the host produces mRNA compliment 2. 2.Production of new viral proteins, or join with the DNA of the host cell 3.Directs production of new viruses
Viral Diseases l Measles l Polio l Smallpox l Influenza l S.A.R.S. l Bird flu
“The single biggest threat to man's continued dominance on the planet is the virus!” -Joshua Lederberg, Ph.D, Nobel laureate 1969 (won prize with Beadle and Tatum) Actually, he won the prize for discovering that bacteria can exchange genes… but what a great quote!
EMERGING VIRUSES: HOW? HOW?HOW? HOW? Mutations of existing virus
Dissemination from a small, isolated population Increasing viral traffic ie. new roads can allow virus to spread between previously isolated areas
Mutated form spread from animals
How to combate Virus? VACCINES - - * variants of pathogen *stimulates the immune system to “arm” and “defend”
Note: Can prevent some viral illnesses, Cannot cure the viral infection Note: Can prevent some viral illnesses, Cannot cure the viral infection
Some viruses cause
Human papilloma virus
Viral nucleic acid becomes integrated into the hosts DNA
Proto-oncogenes code for proteins that affect the cell cycle.