porphyromonas gingivalis bacteria

porphyromonas gingivalis periodontosis 3d illustration periodontal disease periodontitis dentistry esophagus esophageal cancer tumor oncology onco rheumatoid arthritis joints bacterium microbe microbiology science research medicine pathogenic pathogen gramnegative anaerobe anaerobic intestine oral cavity microorganism rod colorful background bacteriology bacteroidetes chronic alzheimers gingipain gum