Sexual-health experts disagree on why the rate of infections is swelling in Europe. What is not disputed is the danger the surge poses https://www.economist.com/europe/2026/08/09/sexually-transmitted-infections-are-surging-in-europe?taid=6ae884aa13e4ae000129fbbf&utm_campaign=editorial-social&utm_content=discovery.content&utm_medium=social-media.content.np&utm_source=twitter