Fig. 1.
Distribution of severe acute respiratory infections (SARI) case-patients reported by month of onset of illness and month of vaccination, pilot influenza vaccine effectiveness case–control study in Central-America, 2012 (N = 1,186)
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.