Introduction of bacteria into the amniotic cavity has been associated with
oral sex through an ascending infectious route. Previous reports have impli
cated 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 relat
ionship 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 appa
rent aetiology. A history of recent cunnilingus may be associated with the
presence of Streptococcus viridans in the amniotic fluid.