In the 2011/12 season, three influenza outbreaks were studied in nursing homes with high vaccination coverage in Navarre, Spain. Attack rates ranged from 2.9 % to 67%. Influenza A/Stockholm/18/2011(H3N2) virus strain was isolated from the three outbreaks. Vaccination should be complemented with other hygiene measures in nursing homes. Early detection of influenza outbreaks in nursing homes can aid in their control. Four influenza-like illness (ILI) outbreaks have been detected in nursing homes in Navarre, Spain, during the 2011/12 wave of seasonal influenza. Three of these outbreaks were reported rapidly after the detection of the first cases. These outbreaks were investigated by the epidemiological surveillance unit in the regio
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