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After a 12-year hiatus, military recruit training centers resumed administration of adenovirus type 4 and type 7 vaccine, live, oral (adenovirus vaccine) to trainees beginning in October of 2011. Subsequently, rates of febrile respiratory illnesses (FRI) and adenovirus isolations markedly declined. These findings are consistent with those of a placebo-controlled efficacy trial conducted prior to the vaccine’s licensure by the FDA.  Continued surveillance will clarify the longer term impact of vaccine use.