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Streptococcus Pneumoniae & Viridans - Free Sketchy Medical Lesson

Streptococcus pneumoniae, causes, prevention, diagnosis, treatment & prognosis

When you hear “Streptococcus,” do you immediately think bad? You’re not alone. Harmful species—like Streptococcus pyogenes (strep throat) or Strep mutans and S. sobrinus (cavities)—get all the attention. But here’s what’s often overlooked: There are 72 species of Strep bacteria identified and 36 live in the human body. Of those, 18 live in the mouth—and the large majority are beneficial or harmless! ✅ These good bacteria (known as commensals) help protect the oral microbiome and keep mouth pH ba