Another 3,237 people tested positive for Covid on Monday (427 had possibly previously been infected with Covid) as experts say a new variant is not needed to start a fifth wave of infections in South Africa. Another 3,237 people tested positive for Covid on Monday (427 had possibly previously b.
You may be at risk of catching the new subvariants BA.4 or BA.5 even if you had the original omicron, virologist Alex Sigal told DW's Science Unscripted.
Scientists have found a decrease in the ability of antibodies from a previous Omicron infection in unvaccinated people to neutralise the subvariants. Vaccinated people fared better.