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Hopes that we were finally beating Covid-19 have disappeared with the news of a new variant, Omicron.
Omicron's been spreading quickly across the world.
It was initially discovered by scientists in Lancet Laboratories, South Africa.
As they were studying PCR test results, they noticed some strange features.
It was unclear whether they'd identified a completely different virus or another variant.
They carried out DNA tests.
Professor Eftyxia Vardas is head of virus monitoring at Lancet Laboratories.
She sent the results to the National Institute for further analysis.
Scientists examined the tests and realised that Omicron had started to replace the Delta variant.
Until that point, Delta had been responsible for most South African Covid-19 infections.
However, Omicron was now spreading far more quickly.
Countries responded by closing their borders to travel from southern Africa.
But Omicron was already appearing all over the world.
Professor Vardas says researchers need to learn more about how Omicron spreads.
Scientists are now involved in a global effort to predict what Omicron means for the pandemic.
Early data from the World Health Organisation suggest that the new variant is transmitted between people more easily.
However, it seems that symptoms for those who catch it may be milder.
