Which of the following statements best describes the action of vaccines?

+1 vote

 

Vaccines are always made from attenuated viruses.

Vaccines contain antigens that stimulate immune system cells and "prime" the immune system for a subsequent infection with a particular virus.

A vaccine boosts the overall activity of the immune system, making it better able to fight off any pathogens.

A vaccine is given at the same time as a suspected infection, to compete with the actual virus.

 

asked Dec 29, 2012 in Biology by anonymous
    

1 Answer

0 votes

 

Vaccines contain antigens that stimulate immune system cells and "prime" the immune system for a subsequent infection with a particular virus.

 

answered Dec 29, 2012 by anonymous



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