Table 2.
Initial Symptoms and Signs of Naturally Acquired Influenza A and B Virus Infections Reported at Acute Respiratory Illness (ARI) Onset
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.