Flu vaccine drives can prevent potentially deadly influenza outbreaks in nursing homes but only if both residents and staff are immunized, U.S. researchers reported on Wednesday.
Vaccinating elderly residents alone did not decrease the number of flu outbreaks, nor did vaccinating staff alone, the study by the nonprofit Rand Corporation found.
But if more than 55 percent of the staff and more than 89 percent of the residents were vaccinated for influenza, outbreaks of influenza-like-illness were reduced by 60 percent, the study said.