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One of the most frequent is the Streptococcus viridans. If a more malignant form of endocarditis develops on a mild endocarditis, the diagnosis is generally not difficult. If, without a definite known septic process, malignant endocarditis develops, localized symptoms of heart disturbance and cardiac signs may be very indefinite.
The Streptococcus viridans is one of the most dangerous of these bacteria. Mild endocarditis is rarely a primary affection, and is almost invariably secondary to one of the diseases named above. Nearly 75 percent of secondary endocarditis occurs as a complication of acute articular rheumatism and chorea, or subsequently.
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