The nasopharyngeal and oropharyngeal swabs of a patient were collected for the first time in South Africa on February 25th, 2022, and uploaded to the Global Influenza Sharing Database (GISAID) for the first time on March 25th,1May. The case is prevalent in South Africa, Portugal, Britain, Israel and other places. Recently, in France, the Netherlands and other European countries and the United States, the number of infected people has also increased. In April this year, the first case of OmicronBA.5 was detected in Hongkong, China.
Compared with BA.2, the effective regeneration number (Rt value) of BA.5 is higher, that is, a patient can infect more people on average during the infection period. In about 2-3 days, it is estimated that the spread of virus variant BA.5 is at least 20-30% higher than that of ba.2. ..