Study Links Severe Infections to Dementia Risk

A new study from researchers at the University of Helsinki has found that severe infections, such as urinary tract infections and unspecified bacterial infections, are associated with a higher risk of developing dementia later in life, even after accounting for other underlying health conditions. The research, based on nationwide Finnish health records, suggests these infections may independently contribute to cognitive decline, particularly when they require hospital treatment.

The study examined data from 62,555 individuals aged 65 or older who received a dementia diagnosis between 2017 and 2020. These cases were compared to 312,772 matched controls without dementia, with analyses focusing on hospital-treated diseases recorded over the prior 20 years. Researchers identified 29 conditions strongly linked to increased dementia risk, including 27 non-infectious diseases such as Parkinson's disease, alcohol-related mental disorders, and mental disorders stemming from brain damage or physical illness. The two infectious conditions were cystitis, a type of urinary tract infection, and bacterial infections of unspecified sites.

Nearly half of the dementia cases, or 47 percent, had...