fective endocarditis. Streptococci and Staphylococci make up a very large fraction of cases of infective endocarditis, with Streptococci accounting for50 to 60% of such infections and Staphylococci accounting for another 25%. The viridans group of Streptococci includes the nutritionally variant organism which now has a new genus. They are now called abiotrophia. Abiotrophia defectivus. These are organisms that look like a viridans or any green hemolytic Streptococci that have unusual nutritional requirements.Enterococci. Enterococcal infections are much less common in kids then they are in adults, and it is certainly true for endocarditis. Occasionally, we have seen other Streptococcal organisms. Strep pneumoniae in beta hemolytic Streptococci, such as group C and T, Bs occasionally. So, this is the predominant group of origin. The two situations in which Staphylococci are particularly common, as far as this hemolyticcarditis, are in the postoperative patient and in the patient who developed endocarditis in a normal heart.