A bacterial infectious process affecting the gums. It is characterized by the development of necrotic, ulcerated, and painful lesions with creation of pseudomembranes extending along the gingival margins. The disease is necrotizing ulcerative gingivitis (MONDO_0006865). Also known as: ANUG, Vincent angina, Vincent's angina, Vincent's angina - pharyngitis, Vincent's disease, Vincent's infection, any site, acute necrotising ulcerative gingivitis, acute necrotising ulcerative gingivitis [ambiguous].