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U.S. Food and Drug Administration staff reviewers on Sunday said Pfizer-BioNTech’s COVID-19 vaccines were effective and safe for use in children aged 6 months to 4 years.

Pre-orders of vaccines for children under age five have been slow, but Biden administration senior officials say they are not alarmed and expect the pace to pick up after federal approvals later this month.

A look at some of the latest COVID-19 news includes the U.S. Food and Drug Administration’s plans to review changes to Novavax’s manufacturing process before the regulatory agency authorizes the company’s vaccine. Moderna expects to submit data to regulators soon with expectations of the company’s bivalent COVID-19 vaccine—consisting of the original Spikevax vaccine and a newer version, mRNA-1273.214 that contains an Omicron-specific vaccine—becoming available in late summer.

Moderna Inc. said on Wednesday a new version of its coronavirus vaccine produced a better immune response against Omicron than the original shot, as the drugmaker pursues a booster against a surge in infections in the fall season.

Advisers to the U.S. Food and Drug Administration on Tuesday voted overwhelmingly to recommend that the regulatory agency authorize Novavax Inc.’s COVID-19 vaccine for use in adults, which the drugmaker hopes can become the shot of choice among some American vaccine skeptics.

Johnson & Johnson and Emergent BioSolutions are accusing each other of breaching their COVID-19 vaccine supply agreement.

Contract manufacturer Emergent BioSolutions Inc. said on Monday U.S. drugmaker Johnson & Johnson (JNJ.N) had breached an agreement by failing to buy the minimum quantity of COVID-19 vaccines made by the company.

U.S. Food and Drug Administration staff said on Friday they were concerned about a possible risk of heart inflammation from Novavax Inc.’s vaccine, even as the company’s data showed the vaccine was effective in reducing the risk of mild-to-severe COVID-19.

In the months before it acknowledged its first official COVID-19 outbreak, North Korea suddenly imported millions of face masks, 1,000 ventilators, and possibly vaccines from China, trade data released by Beijing showed.

Drugmakers Pfizer Inc and BioNTech SE said on May 23 that three doses of their COVID-19 vaccine generated a strong immune response in children under age 5 and was safe and well-tolerated in their clinical trial.