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.
(A) TEM image of influenza virus mainly in spherical shapes with particle sizes around 100–150 nm; (B) Schematic diagram of an influenza A virus, representing the virus components, including surface glycoproteins HA and NA, M1, and M2 protein, nonstructural proteins, and nucleoproteins.
