To answer your question specifically, please refer to the following journal article: https://journals.asm.org/doi/10.1128/iai.00338-08#:~:text=Streptococcus%20sanguinis%20is%20one%20of,species%20implicated%20in%20infective%20endocarditis. “Streptococcus sanguinis is one of the pioneers in the bacterial colonization of teeth and is one of the most abundant species in the oral biofilm called dental plaque. S. sanguinis is also the most common viridans group streptococcal species implicated in infective endocarditis.”
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we should also add, this is formed ON, does not cause (sanguninis specifically cuz someone inevitably will gloss over this fact)