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“They said they were in close contact with A.F.S. Beijing and were advising the students to just stay inside,” Ms. Berardo recalled.

A.F.S. and D.K. designed the study, and A.F.S. performed all experiments.

S.B.T. performed zebrafish studies with supervision by A.F.S.

But he thought he ought to see more of the U.S. than just the school he went to in Beaver Dam, Wis. So did the A.F.S., but it didn't know where the money would come from.

Local civic groups put the students up, and Greyhound lent a bus; the entire cross-country trip for 29 students set A.F.S. back less than $2,000.