Question

Vaccines are effective in preparing disease because they?

Answer 1

do you have a guess

Answer 2

consist of bacteria that could infect healthy cells.

Answer 3

medal please

Answer 4

Vaccines take advantage of your bodys natural ability to learn how to eliminate almost any disease-causing germ, or microbe, that attacks it.

Answer 5

http://en.wikipedia.org/wiki/Vaccine

Answer 6

I think you mean "preventing" not "preparing"? Or do you mean effective at preparing the body...?