In countries without much sequencing, new versions of the Covid virus can go unnoticed. Scientists across Africa are collaborating to track them down.
In mid-February, three travelers were stopped at the airport in Luanda, Angola. Even during the pandemic, the country, a hub for the oil industry, had seen plenty of passengers from Europe and South Africa, where two concerning variants of the virus that causes Covid-19 hold sway. But the strains weren’t yet circulating widely in Angola, so this winter, health officials battened down the hatches. Before any passports get stamped, travelers receive a rapid antigen test and wait 30 minutes for a result. A negative test means self-quarantine,
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