Scenario analysis for delayed vaccine availability (by week)1, assuming 16-week influenza epidemic.

LR = lower-risk; HR = higher-risk.121% influenza illness attack rate, mid-range costs assumption.2For children http://www.cdc.gov/h1n1flu/vaccination/public/vaccination_qa_pub.htm For children ≥10 y, only one dose is needed.; vaccination would need to have been initiated ≥2 weeks earlier for peak antibody response. Intermediate protection in between weeks 3 and 5 for children who have received the first of two doses is conservatively assumed to be zero.3Vaccination is assumed to require 2 weeks to achieve full protection.4For individuals ≥10 y, only one dose is needed. Vaccination would need to have been initiated ≥2 weeks earlier for peak antibody response.