Fever and Wheezing Events in Children After US Influenza Vaccines Using Text Messaging

Inclusion Criteria: 1. are 2 through 11years of age, 2. have a visit at a study site anytime during the study period, 3. receive first dose or second dose of LAIV4 or IIV in the season, 4. the parent has a cell phone with text messaging capabilities, and 5. the parent and child \> 7 years of age speaks English or Spanish at the Columbia sites or English at the Boston site. Exclusion criteria: 1. presence of fever ≥100.4 at time of vaccination, 2. administration of any antipyretic in the 6-hour period prior to vaccination, 3. stated intent, at time of vaccination, to use prophylactic antipyretics before the development of a fever, 4. parent only speaks a language other than English or Spanish at the Columbia sites or English at the Boston site. 5. enrollee is a child \>7 years of age who only speaks a language other than English or Spanish at the Columbia sites or English at the Boston site. 6. parent's inability to read and send text messages, 7. sibling already enrolled this season (OR cell phone # already used for another child) 8. chronic medical condition considered by ACIP to be a precaution or contraindication for LAIV1 (except for asthma), 9. current asthma exacerbation, or exacerbation in the last 2 weeks 10. use of oral or other systemic steroid within the last 2 weeks