WASHINGTON, United States (AFP) — US biotech firm Moderna said Sunday that American officials have delayed approving its Covid-19 vaccine for teenagers to allow more time to better assess the potential risk of developing myocarditis, or heart inflammation. The US Food and Drug Administration (FDA) on Friday “informed Moderna that the agency requires additional time to evaluate recent international analyses of the risk of myocarditis after vaccination,” the biotech company said Sunday in a statement. […]