Potential anaphylactic reactions following vaccination. May not protect all vaccinees. Increased risk of wheezing following vaccination in childn <5 yr w/ recurrent wheezing & persons of any age w/ asthma. Has not been studied in persons w/ severe asthma or active wheezing. Carefully consider potential benefits & risks of vaccination w/ FluMist Trivalent if Guillain-Barré syndrome has occurred w/in 6 wk of any prior influenza vaccination. Effectiveness has not been studied in immunocompromised persons. Safety has not been established in individuals w/ underlying medical conditions that may predispose them to complications following wild-type influenza infection. Not approved for use in childn <2 yr & elderly ≥65 yr.