Common Oral Bacteria Linked to Higher Stroke Mortality, Study Finds
New research reveals that Streptococcus anginosus, a common mouth and gut bacteria, is associated with increased stroke risk and worse outcomes in stroke survivors, potentially revolutionizing how we assess and prevent stroke risk through oral health management.
A Japanese study has identified a significant link between a common oral bacteria and increased stroke risk, potentially transforming how healthcare providers approach stroke prevention and risk assessment. The research, presented at the upcoming American Stroke Association's International Stroke Conference 2025, found that elevated levels of Streptococcus anginosus in patients' guts were associated with a 20% higher risk of stroke and worse outcomes over a two-year follow-up period.
The study, conducted at Japan's largest stroke center, examined 189 stroke patients and 55 non-stroke participants, revealing that stroke survivors with S. anginosus in their gut had significantly higher mortality rates and major cardiovascular events compared to those without the bacteria. Notably, other bacteria, including Anaerostipes hadrus and Bacteroides plebeius, were associated with reduced stroke risk by 18% and 14% respectively.
These findings could have far-reaching implications for stroke prevention and risk assessment. 'If there was a quick test to detect harmful bacteria in the mouth and gut, we could use the information to help calculate stroke risk,' said Dr. Shuichi Tonomura, the study's lead author. The research emphasizes the crucial role of oral hygiene in stroke prevention, as S. anginosus contributes to tooth decay by producing enamel-eroding acids.
While the study's findings are preliminary and based on a relatively small, Japanese population, they represent a significant step forward in understanding the relationship between oral health and stroke risk. The research suggests that future stroke prevention strategies might include targeted approaches to managing oral bacteria populations, potentially opening new avenues for preventive medicine and risk assessment in cardiovascular health.