An official website of the United States government
Here's how you know
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.
Workflow diagram for EBA sampling and analysis of hard-surface plastic masks and disposable paper hospital masks using LC-MS and immunochemistry analyses. Provided photos are examples and are not representative of the masks used for the experiments conducted in the current study.