Oral bacteria and stroke risk

oral bacteria and stroke risk

Finnish researchers have shown for the first time that the cerebral emboli of stroke patients contain DNA from oral pathogens. 

The researchers from Tampere University analysed thrombus aspirates, which neurointerventional radiologists removed from 75 stroke patients as part of emergency treatment. 

The samples were studied by duplicating bacterial DNA, showing that 79 per cent of the aspirates contained DNA from bacteria that came from the teeth.


The study—published in the Journal of the American Heart Association—is part of a research project at Tampere University, which for 10 years has been investigating the effects of bacterial infection in the development of cardiovascular diseases. 

The research group has previously shown that the same odontogenic bacteria are present in the coronary artery stenoses of patients who have suddenly died, the thrombus aspirates and arterial blood of myocardial infarction patients, ruptured cerebral aneurysms and the thrombus aspirates of patients with lower limb arterial and venous thrombosis.

Cerebral artery thrombosis causes 87 per cent of strokes. Most thrombi originate in carotid artery stenoses from where they travel to block cerebral circulation.

The results showed that a large amount of DNA from streptococcus viridans—normal bacteria in the mouth—was found in cerebral thrombi compared with normal blood samples from the same patients. 

In the oral cavity, streptococci are harmless, but when entering circulation, they might cause, among other things, infections of the cardiac valves. The streptococcus bacteria can directly bind to various platelet receptors, making the patient more prone to blood clots.

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