he global monkeypox outbreak is primarily being driven by sex between men, according to the first major peer-reviewed paper to analyze a large set of cases of the virus. The outbreak, which epidemiologists believe initially began in mid-spring gatherings of gay and bisexual men in Europe, has since alarmed such experts by ballooning to nearly 16,000 cases worldwide. Now infectious disease specialists are developing an increasingly refined understanding of the predominant conduits of monkeypox transmission, as well as the typical disease course patterns. “These data point clearly to the fact that infections are so far almost exclusively occurring among men...