A 30 years old male reported with chief complaint of  constant radiating, gnawing pain that is intensified by eating spicy foods and chewing. He also reported a "metallic" foul taste and an excessive amount of "pasty"saliva. A general examination revealed fever and increased pulse rate. Intra-oral examination showed punched-out, crater like depressions at the crest of the interdental gingival papillae, covered by a gray pseudomembranous slough, in the upper anterior teeth.

This infection is reported to have an increased incidence in
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