Since it was first identified in Colombia in January, the Coronavirus Mu version has spread to 41 countries, including the United States.

On August 30, the World Health Organization tagged the "Mu" variant as an interesting version, as its properties may make it more potent or resistant to vaccines, as a study published on August 13 in the Lancet Infectious Diseases found that "two cases in which The measles virus has managed to escape the effects of the vaccines."

The World Health Organization said, "Although the global prevalence of the Mu variant among infections has dropped and is now below 0.1%, the prevalence in Colombia (39%) and Ecuador (13%) has risen steadily. Since its first identification, there have been some random reports of larger outbreaks of the Mu version from other countries in South America and Europe."

In America, however, the most common variant of Mu in Hawaii and Alaska is less than one percent of the cases in the country, but its potential to be more transmitted or bypass vaccines and natural immunity cause health authorities to monitor the mutation.