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Heart Organism Y/O Presents Murmur Auscultation P/H Shows

Front 35 y/o ♂ presents with a heart murmur upon auscultation. His p/h shows a dental procedure about a week before his visit to your clinic. 

What organism do you suspect? 
What is he at risk for?
What drug can you give prophylactically?
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Viridans streptococci
↓ 
Endocarditis due to previously damaged heart valve which is attacked by organism
↓ 
Administer prophylactic Cefazolin

Tags: microbiology

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