Lab assistant Tammy Brown dons personal protective equipment in a lab at the University of Maryland School of Medicine in Baltimore. She works on preparing positive coronavirus tests for sequencing to discern variants rapidly spreading throughout the country.

BALTIMORE MD – APRIL 09 Lab Assistant Tammy Brown dons PPE in a lab where she works on preparing positive Covid tests for sequencing to discern variants that are rapidly spreading throughout the United States at the University of Maryland School of Medicine on April 9, 2021 in Baltimore, Maryland. Jaques Ravel, a professor of microbiology and immunology at UMD runs the genomic sequencing lab. (Photo by Michael Robinson Chavez/The Washington Post via Getty Images)