In malaria-infested areas, many children tend to suffer several bouts of malaria before becoming immune to the disease. Clearly, what must be happening is that those children’s immune systems are only weakly stimulated by any single exposure to the malaria parasite and need to be challenged several times to produce an effective immune response.
Which of the following, if true, most seriously undermines the explanatory hypothesis?

Question

Examsnet · Accepted Answer

Correct Answer is :  There are several distinct strains of malaria, and the body’s immune response to any one of them does not protect it against the others

GMAT Verbal Reasoning Practice Test 7