Summary: Featuring articles on an mRNA-1273 vaccine to prevent Covid-19, a trial of hydroxychloroquine to prevent Covid-19, breast cancer risk revisited, much ado about certain breast cancer genes, and race and genetic ancestry in medicine; a review article on antithrombotic therapy after acute coronary syndromes; a Clinical Problem-Solving describing the hunt for a diagnosis; and Perspective articles on vaccine innovations, on the search of a better equation, and on learning about end-of-life care from Grandpa. Supplement to the New England Journal of Medicine, Vol. 384, No. 5.
