Covid – BA.4 and BA.5: two new variants detected in South Africa where Omicron was born

The most enigmatic: this recombinant of two variants of Omicron. Explanations.

The crisis from Covid is it behind us? The vague BA.2 sure, but the Covid-19 certainly not. This is essentially what must be remembered from Olivier Véran’s speech this Thursday, which announced with delight the beginning of the end of the subvariant of Omicron. A more contagious, less severe variant, but which sent shivers down the spines of health authorities as the end of restrictions was already fixed.

Read also :
Covid – Omicron: “We have passed the peak of the rebound but the epidemic is not over”, assures Olivier Véran

BA.4 and BA.5

Now that the measures have been lifted, it remains to keep a close eye on the evolution of the virus. And while some specialists predict new variants in line with BA.2 (always more contagious but less severe), here are some recombinants (association of two variants) invite themselves to the feast. Deltacronalso called variant XD is one of them. CAR also, recombinant of BA.1 and BA.2, is even described as more contagious. It is also closely monitored by the World Health Organization (WHO).

Read also :
Covid – Omicron: after the discovery of 600 cases in the United Kingdom, the XE variant “10% more contagious than BA.2” spotted 9,000 km away

If new variants and other recombinants emerge all over the world, we will now have to reckon with BA.4 and BA.5. Of them Omicron subvariants detected as their original strain in South Africa and at Botswana. Of the two, it is BA.4 which most concerns scientists. Since it is a recombinant ofOmicron… and D’Omicron. Consider an alloy of sub-variants BA.1 and BA.3. Which seems to have significant growth in South Africa.

Here’s an early look at the recently categorised BA.4 and BA.5 lineages.

As the categorisation algorithms haven’t flowed out into databases and websites, I’ll attempt this by matching their mutations.

First “BA.4” – showing steady growth in South Africa, up to 9% frequency

— Mike Honey ud83dudc89ud83dudc89ud83dudc89 (@Mike_Honey_) April 7, 2022

BA.4 was also detected in low proportions at UNITED STATES and to Puerto Rico according to our colleagues from Forbes. But also at Denmarkto UK et en Germanyaccording to scientist Cornelius Roemer.

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New variants that are sure to cause a lot of ink to flow.

Then – entirely new Omicron variants have been detected in Southern Africa – BA.4 & BA.5. Already dominant in S Africa. Quite what this means for us is unclear cos we had much bigger BA.2 wave than they did – keep an eye on.

Shows that Omicron emergence *still* happening. 17/18

— Prof. Christina Pagel ud83cuddfaud83cudde6 (@chrischirp) April 8, 2022



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