Periodontal Microbiology — NDEB AFK MCQ
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Correct answer: A — Gram-negative obligate anaerobic rod
P. gingivalis is a Gram-negative, obligate anaerobic, non-motile rod and a major periodontal pathogen classified in the 'red complex' (along with Tannerella forsythia and Treponema denticola) by Socransky. It produces virulence factors including gingipains (cysteine proteinases), fimbriae, lipopolysaccharide, and capsule.
Reference: Lamont – Oral Microbiology and Immunology, 3rd ed., 2019