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Pfizer’s treatment applies an approach that is different from some other products, which doctors say may make it safer for people at risk of heart attacks or stroke.
The latest shots, which target Omicron and its subvariants, could offer protection against a winter surge in cases. But many people are unsure if they’re eligible.
The vaccines seem safe for children and are likely to protect against severe illness. But data on efficacy are thin, and most children have already been infected.
Parents of 4-year-olds should start the vaccination process as soon as possible, according to experts, even if that means beginning with the lower-dose version.
The F.D.A. temporarily halted efforts to authorize the Pfizer-BioNTech vaccine for young children amid several unexpected findings. The coming weeks should bring clarity.