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Covid-19: Omicron variants under close supervision

Public Health France has just published a risk analysis of the new variants, while Omicron BA.2 dominates France.

BA.1, BA.2, BA.3… The Omicron variant of Covid-19 continues to form important subgroups. The expected process, according to experts from Public Health France, which has just analyzed the new variants of Sars-CoV-2. Thus, Omicron now dominates the world with 97.9% of new infections. “Almost exclusive” dominance explained by “transfer advantage over previous variants”, says Public Health France. His immune escape is also a question: with Omicron, vaccine protection is declining faster. Only severe forms seem to be relatively limited in the long run. This variant, which arrived in the Delta, would also be less “immunogenic” with a higher rate of reinfection. The Omicron variant now has five sublines identified in several countries. On variant BA.2, which is currently the majority in France, experts evoke higher transferability and a shorter generation interval (time between two cases). But BA.2 would not cause more severe forms of Covid-19 than strain BA.1.

Recombinant XD monitoring

Sublines BA.4 and BA.5, identified in early April, do not appear to generate any new disturbing characteristics. In addition, the three so-called “related” variants, Alpha, Beta and Gamma, are now classified as “non-circulating” in the world. Rather reassuring, on the other hand, several strains are closely monitored. This is the case with XD recombinant SARS-CoV-2, which combines Omicron and Delta. His supervision in France is “strengthened”. This new variant could more easily replicate in the lungs of its host. On the other hand, it would not be more contagious than previous tribes.

China: new deaths in Shanghai

Twelve people have died on Friday from COVID-19 contamination in Shanghai from 11 a day earlier, health authorities said on Saturday, April 23, whose population is irritated by restrictions imposed to stop the spread. virus. The anger of the people of Shanghai, in the face of draconian measures, is not weakening without the authorities encouraging the reduction of measures aimed at eradicating the virus. “The harder the season, the more you will have to grit your teeth and crouch,” said Gong Zheng, the mayor.