Streptococcus viridans intra-amniotic infection associated with antecedent cunnilingus.

Introduction of bacteria into the amniotic cavity has been associated with oral sex through an ascending infectious route. Previous reports have implicated both Capnocytophaga and Fusobacterium nucleatum via this process. We report a case of Streptococcus viridans intra-amniotic infection occurring at 25 weeks' gestation. Patient questioning revealed a close temporal relationship between the onset of symptoms and previous episodes of cunnilingus. The diagnosis of subclinical bacterial colonization of the amniotic fluid should be considered in patients presenting with preterm labour and no apparent aetiology. A history of recent cunnilingus may be associated with the presence of Streptococcus viridans in the amniotic fluid.