What is the 'Mu' variant

Coronavirus mutations do not give up. Now, the Mu variant, also identified as B.1.621, has been added to the list of the World Health Organization (WHO) with "variants of interest" .

The Mu variant has already been detected in 39 countries and is known to have a group of mutations that may make it less sensitive to the immune protection obtained from COVID-19 vaccines, ie it manages to "get rid" of the effect of vaccines .

 

The strain was first detected in January in Colombia and now accounts for nearly half of the country's infections. Since then, nearly 4,000 cases have been detected and it has spread to more than 40 countries .

Its mutations suggest that it may be more resistant to vaccines, as was the case with the South African "Beta" variant. They also fear it is more contagious .

"Since the first identification in Colombia in January 2021, sporadic cases of the Mu variant have been reported and larger epidemics have been reported in other countries in South America and Europe. Although the general prevalence of the Mu variant among sequenced cases has decreased and is currently, below 0.1%, the prevalence in Colombia (39%) and Ecuador (13%) has steadily increased, ”explains the WHO .

Variants of interest of COVID-19

The WHO currently lists four variants of Covid of interest: Alpha, Beta, Gamma and Delta highly transmissible. Mu is the fifth and is followed by Eta, Iota, Kappa and Lambda.


Most mutations are harmless, but those that allow the virus to spread faster or survive longer in the human body are the ones that will persist.

To date, more than 300 variants of this coronavirus have been detected.

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