Which type of endocarditis is commonly associated with Streptococcus viridans?

Streptococcus viridans is a group of bacteria that are part of the normal flora of the mouth and throat, and they are well-known for their association with subacute bacterial endocarditis. This form of endocarditis typically occurs in individuals who have pre-existing heart conditions, particularly those with damaged or abnormal heart valves.

In cases of subacute bacterial endocarditis, the infection often develops slowly over days to weeks, allowing the organisms to colonize heart valves or endocardial surfaces. S. viridans bacteria gain access to the bloodstream through dental procedures, poor oral hygiene, or even spontaneous bacteremia, particularly in patients with pre-existing heart conditions.

This type of endocarditis is characterized by a slower onset of symptoms, which may include low-grade fever, fatigue, and heart murmurs. The longer duration allows for a distinctive type of vegetative growth on heart valves, which can be crucial for diagnosis.

The other types of endocarditis listed have different etiologies and associations. Nonbacterial endocarditis, for example, does not involve a bacterial infection and is usually related to sterile vegetations. Libman-Sacks endocarditis is associated with systemic lupus erythematosus, and marantic end