chapter 47 section 3 pp. 970- 972 hiv and aids. vaccines vaccines artificially produce acquired...
TRANSCRIPT
Chapter 47 Section 3pp. 970-972
HIV AND AIDS
VACCINES
Vaccines artificially produce acquired immunityVaccine- substance that contains antigen of a pathogen
Causes immune system to produce memory cells
You can make antibodies right away if infected
HIV: human immunodeficiency virus AIDS (acquired immune deficiency
syndrome): weakened immune system caused by the infection of HIV
HIV ≠ AIDS
DEFINITIONS
Caused by a retrovirus1.has enzymes to transcribe its RNA to DNA2.new DNA inserted into host cell’s DNA3.host cell now makes proteins to assemble
more HIV viruses
HIV
Infects helper T-cells and macrophages
Why is this so bad?
Transmission: through fluid containing the virus or cells with the virus (blood, sexually, breast-feeding)
HIV TRANSMISSION
AIDS
AIDS Phase I: few or no symptomsPhase II: worsening of symptomsPhase III: T-cell count goes below 200 cells/mL (normal 600-700)
COURSE OF THE DISEASE
Opportunistic infections: diseases that only strike because of a weakened immune systemEX. Kaposi’s sarcoma, candidiasis, toxoplasmosis, tuberculosis, pneumonia
AIDS AND INFECTIONS
A. mutates and evolves very quickly which makes it difficult to make a vaccine
B. treatment consists of “cocktails” with some patients taking up to 50 pills a day (very expensive!)
TREATMENTS AND VACCINES