A Covid-19 variant called „Mu”seems to have properties of immune escape


A new Covid-19 variant, called “Mu”, also known as B.1.621, is tracked by the World Health Organization. It first was detected in Colombia in January 2021 and has spread to 39 countries. The „Mu” virus variant was also found in almost all American states, excepting South Dakota and Nebraska, with a total of 1,953 cases in the country. “At the moment, it looks like there’s genuine cause for concern in USA, Central America, and South America, but as we saw with Delta, a potent variant can traverse the globe in the blink of an eye,” said Danny Altmann, an immunology expert at Imperial College London. The „Mu” Covid-19 variant is dangerous because it “has a constellation of mutations that indicate potential properties of immune escape.” It can bypass the immunity people get from vaccines and prior COVID-19 infections. The Mu strain needs further study to confirm whether it will prove to be more contagious, more deadly or more resistant to current vaccines and treatments.


“Preliminary data presented to the Virus Evolution Working Group show a reduction in neutralization capacity of convalescent and vaccine sera similar to that seen for the Beta variant, but this needs to be confirmed by further studies,” the last report of WHO added. Exactly how transmissible Mu is has not been determined, but Public Health England recently noted that the variant doesn’t seem to be spreading particularly rapidly, and that it appears “unlikely” to be more transmissible than the delta variant.