Cholera vaccines exist,but the problem is that:
A) they are too expensive
B) they have serious side effects
C) many people refuse to take them
D) they do not remain effective for longer than about 6 months

Question

Quizplus · Accepted Answer

The statement mentions that cholera vaccines exist, but they do not remain effective for longer than about 6 months. Therefore, option D is the best choice as it appropriately addresses the problem with current cholera vaccines. Option A is not correct as the statement does not mention anything about the cost of vaccines. Option B is also not correct as serious side effects are not mentioned. Option C is mentioned, but it is not the best choice as it overlooks the fact that the vaccines themselves have limitations.

Cholera Vaccines Exist,but the Problem Is That