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Control of influenza in the hospital.

Nosocomial transmission of influenza has been reported infrequently; however, patients in general hospitals are often among the most susceptible to the complications of influenza infection. Hospital-acquired influenza may occur more often than is reported, but it may be recognized because of lack of diagnostic facilities or the time required for virus isolation and identification. Based on the mode of transmission in the hospital, the established reservoirs of influenza virus, and duration of virus shedding, isolating patients with influenza may occasionally be useful but restricting visitors is probably not required. Vaccinating hospital personnel with influenza vaccine and, if influenza A is prevalent, giving amantadine hydrochloride to high-risk patients or personnel should both be considered.