The nCoV strain of the Tan Son Nhat transmission chain appeared for the first time in Vietnam

The results of genetic sequencing of nasopharyngeal fluid samples “patient 1979” and two patients from the loading and unloading team at Tan Son Nhat airport showed that they belonged to strain A.23.1 in Rwanda, Africa.

According to the Center for Disease Control of Ho Chi Minh City (HCDC), the results of genetic sequencing were reported by the City Hospital for Tropical Diseases and Oxford University Clinical Research Unit (OUCRU), reported on the morning of February 12.

HCDC confirmed, the virus strain causing the infection chain at Tan Son Nhat airport is not a strain capable of spreading rapidly from the UK (variant B.1.1.7) is causing epidemics in Hai Duong, Quang Ninh; nor is it a South African strain.

Thus, this is the first time Vietnam has recorded the appearance of strain A.23.1 Rwanda; It is also the first time the strain has been recorded in Southeast Asia.

Accordingly, the molecular biology laboratory has obtained three complete genomes from the nose and throat swab specimens of “patient 1979” and of two out of four cases of loading and unloading team at Tan Son Nhat airport. announced by the Ministry of Health on the morning of February 8 (Patient 2002, 2003, 2004, 2005).

The three genomes obtained from the above patients have the genetic similarity of over 99.95%. Thus, the infectious cluster of “patient 1979” and the loading nest patients is more likely to originate from one source of transmission.

The identification results by Pangolin software showed that all three nCoV genomes belong to strain A.23.1. The nCoV strain of group A.23.1 was first detected in Rwanda, Africa around the end of the third week of October 2020.

In addition to Rwanda, A.23.1 has only been discovered in a few other countries around the world, including the United States, United Arab Emirates, Australia, Great Britain, and Denmark. However, there have been no signs of unusual developments in these countries.

Letter Anh


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