A slew of nations moved to stop air travel from southern Africa on Friday, and stocks plunged in Asia and Europe in reaction to news of a new, potentially more transmissible COVID-19 variant.
“The last thing we need is to bring in a new variant that will cause even more problems,” said German Health Minister Jens Spahn, amid a massive spike in cases in the 27-nation European Union, which is recommending a ban on flights from southern African nations.
Within a few days of the discovery of the new variant, it has already impacted on a jittery world that is sensitive to bad COVID-19 news, with deaths around the globe standing at well over 5 million.
It's unclear where the new variant actually arose, but it was first detected by scientists in South Africa and has also been seen in travelers to Hong Kong and Botswana.
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Q&A: New coronavirus variant arises in southern Africa
Health minister Joe Phaahla said the variant was linked to an "exponential rise" of cases in the last few days, although experts are still trying to determine if the new variant, named B.1.1.529 is actually responsible.
From just over 200 new confirmed cases per day in recent weeks, South Africa saw the number of new daily cases rocket to 2,465 on Thursday. Struggling to explain the sudden rise in cases, scientists studied virus samples from the outbreak and discovered the new variant.
On Friday, the World Health Organization was convening a group of experts to assess the data from South Africa.
We know that the new variant is genetically distinct from previous variants including the beta and delta variants, but we do not know if these genetic changes make it any more transmissible or dangerous.
South African scientists have noticed a surge of cases, but we don't know if the new variant is responsible and it will take weeks to sort out if vaccines are still effective against it.
So far, there is no indication the variant causes more severe disease. South African experts said that as with other variants, some infected people don't have any symptoms.
Even though some of the genetic changes in the new variant appear worrying, it's still unclear if the virus will pose a significant public health threat. Some previous variants, like the beta variant, initially concerned scientists but didn't end up spreading very far.
Francois Balloux, director of the Genetics Institute at University College London said it was impossible to make any predictions about whether or not the virus was more dangerous or infectious based on its genetic make-up alone.
The coronavirus mutates as it spreads and many new variants, including those with worrying genetic changes, often just die out. Scientists monitor COVID-19 sequences for mutations that could make the disease more transmissible or deadly, but they cannot determine that simply by looking at the virus. They must compare the pattern of disease in outbreaks to the genetic sequences and sorting out whether there is an actual connection can take time.
Peacock said the variant "may have evolved in someone who was infected but could then not clear the virus, giving the virus the chance to genetically evolve," in a scenario similar to how experts think the alpha variant — which was first identified in England — also emerged, by mutating in an immune-compromised person.
Maybe. As of noon Friday, travelers arriving in the U.K. from South Africa, Namibia, Botswana, Lesotho, Eswatini and Zimbabwe will have to self-isolate for 10 days. European Union nations also moved quickly on Friday to try to stop air travel from southern Africa.
Given the recent rapid rise in COVID-19 in South Africa, restricting travel from the region is "prudent," said Neil Ferguson, an infectious diseases expert at Imperial College London.
Balloux of University College London said that if the new variant turns out to be more infectious than delta, the new restrictions will have little impact but that they could still buy the U.K. some time to boost vaccination rates and roll out other possible interventions.
The World Health Organization has convened a technical group of experts to decide whether the new variant warrants being designated a variant of interest or a variant of concern. If they do, the variant will likely be named after a letter of the Greek alphabet, in line with the current naming system.
Variants of interest — which currently include the mu and lambda variants — have genetic changes known to affect things like transmissibility and disease severity and have been identified to cause significant clusters in multiple countries.
Variants of concern — which include alpha, beta and delta — have shown they can spread more easily, cause more serious disease or make current tools like vaccines less effective.
To date, the delta variant remains by far the most transmissible form of COVID; it accounts for more than 99% of sequences shared with the world's biggest public database.
In better news, U.S. health officials said Merck’s COVID-19 pill is effective, will seek advice next week on safety during pregnancy. Here are other updates today:
