Critical Thinking: A child appears healthy until approximately 9 months of age. Then the child develops severe
bacterial infections. One after another. Fortunately, the infections are successfully treated with
antibiotics. When infected with measles and other viral disease, the child recovers without
difficulty.

Adouble-blinded trial for a new indication is conducted under an ind comparing two (2) marketed drugs, at twice the approved prescribed doses. on day 2, subject 603 had difficulty breathing. although it was life-threatening initially, subject 603 was treated and discharged directly from the emergency department after complete recovery. on day 5, subject 20 had a headache, which led to hospitalization and required blood pressure lowering medications. these episodes cannot be explained on the basis of the pharmacological property of either drug or the subjects' medical histories. the investigator would submit an sae report for