Risk factors

Factors that can increase the risk of rheumatic fever include:

• Family history. Some people carry a gene or genes that might make them more likely to develop rheumatic fever.
• Type of strep bacteria. Certain strains of strep bacteria are more likely to contribute to rheumatic fever than are other strains.
• Environmental factors. A greater risk of rheumatic fever is associated with overcrowding, poor sanitation and other conditions that can easily result in the rapid transmission or multiple exposures to strep bacteria.