Chronic fatigue syndrome (CFS) is a debilitating disease of unknown etiology that is estimated to affect 17 million people worldwide. Studying peripheral blood mononuclear cells from patients with CFS, researchers identified DNA from a human gamma-retrovirus (XMRV) in 68 of 101 patients, compared with 8 of 218 healthy controls.
What percent of individuals in the study were found to have XMRV DNA?

Question

Quizplus · Accepted Answer

To find the percentage of individuals in the study found to have XMRV DNA, we divide the number of individuals with XMRV DNA by the total number of individuals in the study and multiply by 100.

Number of individuals with XMRV DNA: 68 
Total number of individuals in the study: 101 + 218 = 319

(68/319) x 100 = 21.3%

Therefore, the answer is choice B.

Chronic Fatigue Syndrome (CFS) Is a Debilitating Disease of Unknown