What is the Mu coronavirus variant, and should Hong Kong be worried?

A new coronavirus variant that could be more vaccine resistant was detected over the summer by Hong Kong authorities after first being found in South America. Local health officials say the city has imposed stringent measures, including testing, contact tracing and inbound restrictions, to prevent the spread of variants. The Post takes a look at the new variant, named Mu, and how much of a threat it is to public health. What do we know about the Mu variant? Mu, also known as B. 1.621, was first found in Colombia in January, and the World Health Organization (WHO) added it…