UTI Bacteria Evolved Over Two Years to Invade Woman's Brain, Study Finds

A woman who developed a urinary tract infection later suffered a severe brain infection caused by the same bacteria two years on. Over that period, the bacteria had undergone genetic evolution, becoming significantly more dangerous and invasive. The case has been documented by researchers as a rare example of a phenomenon known as heterovirulence, where a pathogen shifts in virulence over time within a host. This finding offers new insight into how common bacterial infections can potentially escalate into life-threatening neurological conditions. The report is considered novel in medical literature for demonstrating this evolutionary progression in a single patient.