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People who've already had the original omicron can also be infected by the latest mutations of the variant, B.A.4 and B.A.5.
Despite its many mutations, experts are not overly concerned about IHU coronavirus variant B.1.640.2, first discovered in a traveler returning from Cameroon to France.
Fueled by the spread of the omicron variant, infection rates are skyrocketing in Europe, and New Year's Eve gatherings won't help.
Researchers in South Africa say there appears to be evidence that the omicron strain of coronavirus is less virulent than delta. In the US, New York state is to reintroduce its mask mandate. Follow DW for more.
Days after the new COVID-19 variant omicron was identified in South Africa, ever more countries are moving to close their borders to stem its spread. What travel restrictions are in place and can they be effective?