BA.5 spreads 12% faster than the common variant in Vietnam, the number of cases will increase

Spread 12% faster than the popular BA.2 subvariant in Vietnam

Subvariant BA.5 was first recorded in South Africa in January 2022 and quickly spread in many countries around the world.

This sub-variant contains several mutations (L452R, F486V and R493Q) compared with the BA.2 sub-variant, preliminary studies show a significant change in antigenicity compared with the two BA variant lines. .1, BA.2 is spreading in popularity.

This sub-variant has the ability to spread 12% faster than sub-variant BA.2 (popular sub-variant in Vietnam today). To date, there is no evidence that the sub-variant BA.5 is more virulent and causes more severe disease than the previous variants.

According to the World Health Organization (WHO), currently licensed vaccines are still highly protective, reducing the risk of severe disease for all SARS-CoV-2 virus variants (including SARS-CoV-2). including sub-variant BA.5).

Therefore, WHO recommends that countries maintain response measures such as booster vaccination, booster vaccination for at-risk groups, and protection of severe disease.

BA.5 spreads 12% faster than the popular variant in Vietnam, the number of cases will increase - Photo 1.

Around the world, many countries have detected sub-variant BA.5 such as: Germany, Belgium, France, Austria, Italy, Portugal, Denmark, Norway, Spain, Switzerland, UK, USA, Canada , Australia, Israel, Pakistan, Singapore, Indonesia, Philippines, Thailand, Brunei… In South Africa, the incidence of this subvariant has increased from less than 1% in January 2022 to 20% by the end of April. via. To date, South Africa is the country with the highest prevalence of this sub-variant infection.

Currently, the World Health Organization (WHO) has put the sub-variant line BA.5 on the list to monitor. The European Center for Disease Control and Prevention (ECDC) initially identified the BA.5 subvariant of Omicron that has been reported in many European countries and increased in several countries in recent weeks, recommending the The country needs to maintain response measures such as booster vaccination, booster for at-risk groups, and strengthen the key surveillance system.

The number of infections with sub-variant BA.5 may be more recorded in the community

In Vietnam, on June 15, through the infectious disease surveillance system at Bach Mai Hospital, 3 cases of infection with sub-variant BA.5 were detected.

According to initial investigation information from the Central Institute of Hygiene and Epidemiology, Bach Mai Hospital determined that these 3 infections were recorded in the community, were Vietnamese people in the same family, who came to check their health at the hospital. Bach Mai Hospital on May 26 and took samples for testing.

GS. Phan Trong Lan, Director of the Department of Preventive Medicine, Ministry of Health, said that the Ministry of Health has directed the Institutes of Hygiene and Epidemiology/Pasteur to investigate and monitor the circulation of the sub-variant BA.5. as well as other variations. According to the monitoring system’s report, variant BA.2 is still the dominant variant in the community.

Through monitoring in the past time, the trend of Covid-19 epidemic nationwide is generally still decreasing, but in recent days, it has slowed down to about 600-700 cases per day; The number of severe cases and deaths continues to decrease. In the past 30 days, the death/infection rate was 0.02%, of which the number of cases decreased by 4.5 times and the number of deaths decreased by 10 times compared to the previous month, there were 24 days without a death in the whole country.

According to the Department of Preventive Medicine, Ministry of Health, in the world, the sub-variant BA.5 of Omicron has been recorded in many countries and is likely to continue to penetrate into Vietnam; At the same time, our country has also recorded cases of infection with sub-variant BA.5 in the community, so in the coming time, more cases of BA.5 sub-variant infection may be recorded in the community in our country. Thus, the number of cases may increase in the near future due to the appearance of sub-variant BA.5.

The rate of increase in the daily incidence of Covid-19 depends on various factors such as the nature of the variation in infectivity (the SARS-CoV2 virus frequently mutates and is unstable); Immunological protection (acquired or vaccinated) decreases with time and vaccine coverage; infectious block; response capacity and prevention and control measures of Vietnam.

The Department of Preventive Medicine said that it is difficult to forecast the specific increase in the coming time. However, data reported from European countries, South Africa, when the BA.5 subvariant appeared, the spread was fast with the daily increase of the BA.5 subvariant about 12-13%. compared to variant BA.2 and will gradually replace sub-variant BA.2.

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