On March 12, the Guangdong Provincial Center for Disease Control and Prevention successfully found the B.1.525 Nigerian mutant strain for the first time in nasopharyngeal swabs from two imported cases of new coronary pneumonia. The virus isolation work is still in progress. This is the Guangdong Provincial Center for Disease Control and Prevention found the B.1.1.7 mutant in a throat swab sample of a confirmed case of new coronary pneumonia imported from the United Kingdom on January 2 and a South African case of new coronary pneumonia imported from abroad on January 6. Since the South African mutant strain of 501Y.V2 was isolated from the throat swab, the new coronavirus mutant strain has been found again.
The two cases were asymptomatic infections imported from abroad. They were found in closed-loop management. They were reported as asymptomatic infections on February 21 and February 22 respectively. They are still undergoing intensive medical observation in the hospital. On March 5, the Guangdong Provincial Center for Disease Control and Prevention received nasopharyngeal swab samples from two cases sent by the Guangzhou Center for Disease Control and Prevention, and immediately began virus isolation and genome sequencing analysis. On the morning of March 12, 2021, the original sample was sequenced and analyzed, and the results showed that it was B.1.525 subtype, a Nigerian mutant.
Currently, the Nigerian mutant of the new coronavirus has spread in 26 countries around the world. Research reports have found that the Nigerian mutant strain enhances the spread of the virus, which can easily lead to the appearance of antibody neutralization and escape, which may lead to re-infection in cases of new coronary pneumonia.