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.
Micrographs of negative samples for SARS-CoV-2 and positive for other viruses. (A) NL63 Coronavirus; (B) KU1Coronavirus; (C) Adenovirus (size = 73–133 nm); (D–F) Influenzavirus (ellipsoidal shape, size = 110–185 nm). Arrows show viral particles. Scale bars are shown on the micrographs.
