Causative Organisms

Gram-positive bacteria are the most common organisms that produce IE. Streptococci and staphylococci species account for the majority of cases at more than 80%. 6 Virid-ans group streptococci have been considered the primary pathogens in IE. However, staphylococci have been increasing in prevalence as causative organisms and are the dominant causative organisms in some reports (Table 74-1).5,17,1 Other gram-positive, gram-negative, atypical, and fungal organisms are less common but still must be considered in certain patient populations.

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