Since 1975 there has been in the United States a dramatic decline in the incidence of traditional childhood diseases such as measles. This decline has been accompanied by an increased incidence of Peterson’s disease, a hitherto rare viral infection, among children. Few adults, however, have been affected by the disease.
Which of the following, if true, would best help to explain the increased incidence of Peterson’s disease among children?

Question

Examsnet · Accepted Answer

Correct Answer is :  Children who contract measles develop an immunity to the virus that causes Peterson’s disease.

GMAT Verbal Reasoning Practice Test 5