Alpha-hemolytic strep is one class of streptococcus bacteria
that does cause infective carditis (IE). Viridans Streptococcus, a
specific strain of Alpha-hemolytic streptococcus is a cause of
IE.
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In suppurative parotiditis, the most common isolate is Staphylococcus aureus, followed by Streptococcus viridans
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from the streptococcus genus but i dont know which species
specifically... it may well be a few streptococcus species :)