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The United States has already delivered more than 4 million doses of COVID-19 vaccines for children under 5 years old to sites that will administer the shots, a Department of Health and Human Services (HHS) spokesperson said on Thursday.

Nearly 1 in 5 American adults who reported having COVID-19 in the past are still having symptoms of long COVID, according to survey data collected in the first two weeks of June, U.S. health officials said on Wednesday.

People infected with the earliest version of the Omicron variant of the coronavirus, first identified in South Africa in November, may be vulnerable to reinfection with later versions of Omicron even if they have been vaccinated and boosted, new findings suggest.

The European Medicines Agency (EMA) started a rolling review on Friday of a variant-adapted COVID-19 vaccine from Moderna, as coronavirus cases linked to Omicron sub-variants see an uptick in the region.

The Omicron variant of coronavirus is less likely to cause long COVID than previous variants, according to the first peer-reviewed study of its kind from the United Kingdom.

People who were infected with an earlier version of the coronavirus and received three doses of an mRNA vaccine – such as the Pfizer/BioNTech shot – appear to be best protected against symptomatic infection by the Omicron variant, according to a large study. Additionally, COVID-19-related neurological symptoms – such as memory and concentration issues – can last half a year or more in some patients, according to a small study.

North Korea reported an outbreak of an unidentified intestinal epidemic in a farming region on Thursday, putting further strain on the isolated country as it battles chronic food shortages and a wave of COVID-19 infections.

Advisers to the U.S Food and Drug Administration on Wednesday unanimously recommended the agency authorize COVID-19 vaccines from Moderna Inc. and Pfizer Inc./BioNTech SE for millions of the youngest American children.

The BA.4 and BA.5 sub-variants of Omicron are estimated to make up about 8.3 percent and 13.3 percent of the coronavirus variants in the United States as of June 11, the U.S. Centers for Disease Control and Prevention (CDC) said on Tuesday.

The Biden administration will drop pre-departure COVID-19 international air testing requirements effective June 12 at 12:01 a.m. after heavy lobbying from airlines and the travel industry, a senior administration official told Reuters.