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WHO to monitor the new Omicron subvariants BA.4 and BA.5

WHO to monitor the new Omicron subvariants BA.4 and BA.5

 


The World Health Organization (WHO) monitors two new Omicron subvariants to assess whether they are more infectious or dangerous.

File image of Covid-19 under an electron microscope.

According to WHO, a small number of cases of BA.4 and BA.5 subvariants have been found “in some countries”.

Both new variants have additional mutations, and WHO said they are monitoring to identify their potential “antigenic escape properties”.

“WHO is working with scientists to further assess the characteristics of these strains and their impact on public health,” the organization said in a weekly briefing update Thursday.

The virus mutates frequently, but only some mutations affect the ability to spread or evade previous immunity from vaccination or infection, or the severity of the disease caused by the virus.

For example, BA.2 currently accounts for almost 94% of all genomically sequenced cases and is more infectious than other subvariants, but previous evidence causes serious disease. Indicates that it is unlikely.

A case of the BA.3 subvariant was detected, but it does not seem to make any progress towards BA.2.

However, WHO Dr. Tedros Adhanomgebreyes said the virus remained deadly.

“The virus becomes more susceptible to infection over time, and remains deadly, especially to unprotected and unvaccinated people who have no access to medical or antiviral drugs,” he said.

WHO is also monitoring another variant, XE, which is a “recombination” of the BA.1 and BA.2 variants of Omicron. This means that the two have been merged.

It is believed to be 10% more contagious than the BA.2 variant. And it was first detected in the UK in January.

Over 1000 cases have been reported in the United Kingdom, but have also been detected in the United States, Japan, India, Thailand and Israel.

New Zealand recorded 9563 new Covid-19 cases on Thursday.. 528 people are infected with the virus, including 28 in intensive care units or highly dependent wards.

Sources

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2/ https://www.1news.co.nz/2022/04/14/covid-19-who-monitoring-new-omicron-sub-variants-ba4-and-ba5/

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