Bacteria evolved in patient's brain over two years
Doctors report a rare case where bacteria from a urinary tract infection evolved and invaded a woman's brain two years later.

Physicians have detailed a concerning case where bacteria responsible for a urinary tract infection evolved over two years, eventually invading a woman's brain. The case report, published in the New England Journal of Medicine, highlights the potential for infections to develop within a patient in unexpected ways.
The 63-year-old woman presented to the hospital with pain and sudden vision loss in her right eye. Brain imaging revealed inflammation in the eye and lesions in the parietal lobe, a brain region critical for processing sensory information. Doctors suspected a brain abscess.
Laboratory results from the woman's blood and urine samples indicated an infection and kidney problems. During a subsequent brain biopsy, surgical teams found pus. Identification of the bacteria from earlier urine samples confirmed the organism was responsible for the condition.
This case suggests that the bacteria, initially causing a urinary tract infection, may have adapted and spread to the brain over the two-year period. Researchers are further investigating the precise mechanisms behind the infection's development and the bacteria's adaptation within the patient's body.