EditorialAnders Rhod Larsen, a microbiologist at Statens Serum Institut in Copenhagen, works with samples of MRSA bacteria, in Denmark, Dec. 12, 2018. (Ciril Jazbec/The New York Times)
EditorialAnders Rhod Larsen, a microbiologist at Statens Serum Institut in Copenhagen, works with samples of MRSA bacteria, in Denmark, Dec. 12, 2018. (Ciril Jazbec/The New York Times)