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00925njm 22002777a 4500 dc Hidalgo-Chicharro, Alberto author Abad, Raquel author Navarro-Marí, José María author Gutiérrez-Fernández, José author 2017 Introduction. Preterm premature rupture of membranes (PPROM) usually has a multifactorial etiology that is often unknown, although the most frequently reported cause is infection by group B Streptococcus. Therefore, the etiology of PPROM, although probably infectious, remains unknown in most cases. This case describes a PPROM caused by infection from oropharyngeal microbiota. Case presentation. We report the case of a 26-yr-old pregnant woman. The gestational age was 32 weeks+5 days. Examinations in the emergency department revealed the release of clear amniotic fluid and a closed multiparous cervix with a length of 22 mm. Endocervical culture evidenced the growth of Staphylococcus aureus, serogroup B Neisseria meningitidis and Haemophilus influenzae. Conclusion. Preventive antibiotic therapy should consider: opportunistic infections by normal genital microbiota, infections due to sexual activity, opportunist microorganisms derived from oral sex, and the hematogenous spread of oral bacteria. JMM Case Rep. 2017;4(10):e005121. 10.1099/jmmcr.0.005121 2053-3721 JMM Case Reports 29188068 http://hdl.handle.net/20.500.12105/13971 Haemophilus influenzae Neisseria meningitidis Staphylococcus aureus Molecular characterization Premature rupture of membranes Preventive antibiotic therapy 32-week premature rupture of membranes caused by oropharyngeal microbiota