A nurse prepares the Oxford/AstraZeneca vaccine in Nairobi on April 21, 2021. [Wilberforce Okwiri, Standard]
U.S. regulators are considering the first Covid-19 vaccine for children under the age of 5, the only age group not yet eligible for the shots, after Pfizer Inc (PFE.N) and BioNTech SE began the regulatory approval process on Tuesday.