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Subjects were children enrolled in a health maintenance organization. At 18 months of age, each
child was randomly given one of two types of vaccine against Haemophilus influenzae. Parents
were asked to record any side effects on a card and mail it back after 2 weeks. What type of
study is this? (Points: 2)
Case-control study
Concurrent cohort study
Nonconcurrent cohort study
Randomized trial
Cross-sectional study
Solution
Experimental study because the investigators rather than the subjects
themselves controlled the exposure

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