bf.7. new variant of the sars-cov-2 coronavirus. subvariant of omicron. horizontal.

bf7 omicron delta variant coronavirus covid covid19 sign icon symbol concept health virus disease design microbe news biology united kingdom microbiology covid-19 abstract plus stay doctor vaccine corona pneumonia epidemic medical quarantine background flu medicine care pandemic illness infection mutation diagnosis test africa contagious sars purple sars-cov-2 subvariant horizontal black text