Sub-option Omicron BA.2 now accounts for the majority of cases in the country, with the number of cases of sub-option BA.2.12.1 increasing, especially in the northeast.

But even those figures do not give a complete picture of the virus’s presence in the country, CDC officials said Tuesday. A CDC study, to be released soon, shows that from December to February there were about three infections for every reported case, depending on the region, said Christy Clark, co-chair of the Epidemiology and Epidemiology Surveillance and Surveillance Agency series. during a briefing with reporters.

The rise in antibodies from 43 percent of Americans in January to 57 percent in February was also faster than CDC officials expected.

Clark warned that the fact that most Americans now have antibodies does not guarantee them protection against re-infection or any type of group immunity, noting that the threshold at which the virus stops circulating is still unknown.

In particular, Covid-19 can be severe in children: 20 to 30 percent of children hospitalized with the virus end up in the intensive care unit, and children develop conditions after Covid, Clark said.

“As a pediatrician and parent, I would continue to support that children get vaccinated even if they have been infected before,” she said.

Vaccination rates among children in particular remain very low, with only 35 percent children aged 5 to 11 years who have received at least one dose, and vaccinations still unavailable for children under five.

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