Last Friday WHO designated variant B.1.1.529 a variant of concern, named Omicron, on the advice of WHO's Technical Advisory Group (TAG-VE). This decision was based on the evidence presented to the TAG-VE that Omicron has several mutations that may have an impact on how it behaves, for example, on how easily it spreads or the severity of illness it causes.
Chinese authorities have decided to go back to restrictive sanitary measures as around 133 cases of COVID-19 were detected in 11 provinces last week. The Beijing marathon has also been suspended.
COVID-19 had been relatively calm in Argentina until last week the number of cases began soaring again, with 7667 infections detected against 946 the week before.
Argentina's Federal Health Council Monday announced that although immunization will not be mandatory, a nationwide house-by-house vaccination campaign will be launched for those who have not registered to take their injections.
Researchers in the Argentine province of Córdoba have found traces of the coronavirus Delta variant in the sewage network, it was reported Monday.