Summary: Featuring articles on postexposure influenza prophylaxis, growth stunting and intestinal microbiota, multisystem inflammatory syndrome in children, and vitamin D supplements for the prevention of tuberculosis; a review article on coffee, caffeine, and health; a case report of a woman who died from Covid-19; and Perspective articles on border babies, on failing the test, on Covid-19 epidemiologic models, and on the pandemic as teacher. Supplement to the New England Journal of Medicine, Vol. 383, No. 4.
