The Mu COVID-19 variant (B.1.621) has been detected in Altamonte Springs, Florida sewage. The virus is shed it in stool or urine. Tests are done on the waste water as a predictor for possible transmissions in a community.
The variant has also been found in 49 other states. As of Oct. 29, 2021 the Mu variant accounts for less than 1 percent of all COVID-19 infections in the U.S., according to the GISAID Initiative, which is an organization that promotes the rapid sharing of data from all influenza viruses and COVID-19. It is still the dominant strain of COVID-19 in Colombia, where it was originally found.
People did not consider Delta to be much of a concern when it came to the United States from India back in June. When a virus takes a foothold it grows at an exponential rate. By the time everyone realized it is a problem it is already too late.
Mu has mutations already in Delta ( B. 1.617. 2) but it also has mutations from Alpha (B.1.1.7), which was also known to be highly transmissible. A lab study pre-print suggests, that Mu is the most immune evasive virus we’ve seen in the pandemic. It could be able to evade the immunity provided by vaccines and prior infections. It has been listed as a a “variant of interest” by the World Health Organization since August 30, 2021.
“Mu looks potentially good at immune evasion,” Danny Altmann, PhD, an immunologist at Imperial College London, told The Telegraph. “For my taste, it’s a stark reminder that this isn’t by any means over. On a planet of 4.4 million-plus new infections per week, there are new variants popping up all the time, and little reason to feel complacent.”