Covid – Omicron: growth advantage, contagiousness, severity, why is WHO carefully monitoring new BA.4 and BA.5 variants?

Only 12 cases have been listed on the international database. And yet, the World Health Organization is already on the alert.

The crisis of covid is it over? If we are to believe the lifting of restrictions everywhere in the world, it seems to be moving away. If we rely on the figures of the epidemic, caution is in order.

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Especially since new variants emerge and cause real concern. After causing the 6th wave, BA.2sub-variant ofOmicronis the perfect example.

Growth advantage

Now these are the recombinant which seem to worry the scientific community. Either variants from the recombination from two variants. Thus was born Deltacronhybrid of Delta and Omicron. Or even the XE varianthybrid of BA.1 and BA.2judge “10% more contagious” than BA.2.

However, two new variants have been detected in South Africa and at Botswanawhere Omicron was born. Two variants which have inherited the appellations BA.4 and BA.5. The first being in particular an Omicron-Omicron recombination (BA.1 and BA.3).

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Two variants which are now closely monitored by theWorld Health Organization (WHO). Because the first estimates show a growth advantage 63% for BA.4 on BA.2 and 84% for BA.5 on BA.2. New strains that could be so much more contagious.

But also more pathogens with mutations that put the WHO on alert. The institution also claims to have started to follow these variants “for their additional mutations that deserve further study to understand how far they can escape the immune system.

A small dozen cases have been reported on the international database GISAID. The United Kingdom Health Safety Agency (UKHSA) claims that BA.4 was detected in Denmarkin Scotland and in England.

So far, BA.5 has only been recorded in South Africa and Botswana.

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