Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Follow-up studies and vaccine efficacy estimates for season 1, season 2, and across seasons on the prevention of acute respiratory infection (ARI) and lower respiratory tract disease (LRTD) with 3 or more signs/symptoms. All results are reported as point estimates in percent value and corresponding 95% confidence intervals. * = provisionary estimate for end of season 2 equals 77.8% (95.0% CI: 51.4, 91.1) [88].
