. What are the three things discussed that an activated T cell does?
B. What was the first vaccine developed (a), by who (b) and approximately when (c)?
C. What agent did the first vaccine use?
D. What type of vaccine did Salk and Sabin develop (a) and what was the difference between the two?
E. Which vaccine, Sabin’s or Salk’s would be better in the a third would county with limited infrastructure (i.e. roads, electricity) and why?
F. Who cannot get a vaccine?
G. Define herd immunity.