The Medicines and Healthcare products Regulatory Agency’s investigation comes after a study showed prenatal exposure to topiramate roughly triples a child’s likelihood of having autism or intellectual disability.
The immunizations are designed to target the latest Omicron subvariants, and are only authorized for people who have already received their primary vaccinations.
The chance of developing cerebral venous sinus thrombosis was nearly 10 times higher in the two weeks following a diagnosis of SARS-CoV-2 infection than after receiving an mRNA vaccine, a data analysis finds.
Rollouts of the shot have ground to a halt following reports of blood clots, but health authorities say that these fears are unfounded and vaccination programs should continue.
The vaccine was 79 percent effective at blocking symptomatic infections, according to data from a Phase 3 trial in the US, Chile, and Peru. A US safety oversight board says the data might be incomplete.