France's public health authority has recommended people under 30 be given Pfizer's Comirnaty Covid-19 vaccine when available instead of Moderna Inc's Spikevax jab, which carries comparatively higher risks of heart-related problems, reports Reuters.

The Haute Autorite de Sante, which does not have legal power to ban or licence drugs but acts as an advisor to the French health sector, cited “very rare” risks linked to myocarditis, a heart disease that had shown up in recent data on the Moderna vaccine and in a French study.