Umea University Oct 9 2025 Researchers at Umeå University have identified a key molecular player that helps bacteria survive the hostile environment inside the body. Their study reveals how the protein RfaH acts as a protective shield for bacterial genes - and points to new strategies for fighting persistent infections. The human body is a very stressful place for bacteria. During infection, the immune system attacks, nutrients are scarce, and microbes are exposed to bile salts, acids and heat.