La versión de ómicron BA.2 es más infecciosa, según científicos británicos
·6 min
The episode begins with Dr. Elmer Huerta introducing the BA.2 variant of SARS-CoV-2, noting its recent emergence. He explains that new variants were expected due to ongoing mass infections and incomplete vaccination coverage. BA.2 was first identified in early December and has since spread to 49 countries, becoming dominant in Denmark by the second week of January, as well as in South Africa and India. Denmark's high genomic surveillance capacity is highlighted as key to tracking such variants. In the United States, BA.2 accounts for less than 1% of cases at the time of recording. The World Health Organization clarifies that BA.2 is a direct descendant of the Omicron variant, with Omicron scientifically named BA.1 and the new variant BA.2. PCR and antigen tests can detect BA.2. The WHO does not yet classify it as a variant of interest or concern, emphasizing that research into its characteristics—like immune evasion and virulence—should be prioritized. In the United Kingdom, BA.2 is considered a variant under investigation. Initial data from Denmark's Statens Serum Institute, part of the Ministry of Health, indicates BA.2 is 1.5 times more infectious than Omicron, though its virulence remains unknown. It is too early to determine if current vaccines are effective against BA.2, but a UK report suggests vaccines may provide 70% protection against symptomatic disease after a booster dose. Dr. Huerta concludes by stressing the importance of avoiding infection to reduce the risk of new mutations. He invites listener questions on Twitter and encourages ratings and subscriptions for the podcast.
