Peritonsillar abscess caused by Mycoplasma hominis and Fusobacterium necrophorum following oral sex.

Mycoplasma hominis is a bacterium that colonizes the genital tract of some females and males, as well as their respiratory tracts. Although only two cases of deep neck infection have been reported, the associations between the onset and sexual intercourse have not been reported. A healthy 19-year-old female was diagnosed with a left peritonsillar abscess. The patient had sexual intercourse with a new partner, including oral sex, two days prior to symptom onset. It was not known whether the male partner had urethritis symptoms. M. hominis and Fusobacterium necrophorum were isolated from the abscess culture. The patient's condition improved after drainage, and sulbactam ampicillin was switched to oral clindamycin.