Dentoalveolar Abscess Microbiology — NDEB AFK MCQ
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Correct answer: E — Streptococcus viridans group (including S. anginosus)
Acute dentoalveolar abscesses are typically polymicrobial infections dominated by viridans group streptococci (particularly the S. anginosus/milleri group), along with obligate anaerobes (Prevotella, Porphyromonas, Fusobacterium, Peptostreptococcus). S. anginosus group organisms are notable for their tendency to form abscesses. The infection is endogenous (from the patient's own oral flora), not from environmental organisms.
Reference: Hupp – Contemporary Oral and Maxillofacial Surgery, 7th ed., 2019