Question

Vaccines prevent disease by

a. bringing bacteria to infect healthy cells.
b. containing specific t lymphocytes.
c. combining with pathogens to inactivate them.
d. preparing the immune system to recognize and destroy pathogens.

Answer 1

Vaccines prevent disease by :

b. containing specific t lymphocytes.

d. preparing the immune system to recognize and destroy pathogens.

Answer 2

the best answer is d.