It found that infection came with a “substantially higher risk” of the inflammatory heart conditions pericarditis and myocarditis compared to immunisation. During the study period, from 1 January 2020 to 31 December 2022, 3.9 million children had a first Covid diagnosis and 3.4 million had the PfzerBioNTech vaccine. In vaccinated youths, there were only 0.85 extra cases, while risks dissipated after a month. “Whilst vaccine-related risks are likely to remain rare and short-lived, future risks following infection could change as new variants emerge and immunity shifts,” she said. “That’s why whole population health data monitoring remains essential to guide vaccine and other important public health decisions.”Main image: Cdc