South Africa, which found omicron variant first, sequences less than 1% of coronavirus samples
Return to menu Passengers undergo coronavirus testing at Rome’s Leonardo da Vinci International Airport on Nov. 28. Italy imposed a travel ban on several African nations after a new coronavirus variant was discovered late last week in South Africa. (Telenews/EPA-EFE/REX/Shutterstock) South Africa’s announcement Thursday that it had identified a new, possibly highly contagious coronavirus variant sent shock waves worldwide . Stock markets fell as the United States, among other countries, imposed a travel ban on southern Africa. Much remains unknown about the mutations that make up the new omicron variant. But what scientists do know is that 20 months and several variants into the coronavirus pandemic, one tool to stem the spread of infection — sequencing the virus to catch significant genetic changes — remains used only patchily. The United States is sequencing and sharing 3.6 percent of its coronavirus samples, according to a Washington Post analysis of da...