Anemia, undernutrition and labor complications drove puerperal sepsis risk in postpartum women
A case-control study from public hospitals in East Shoa Zone, Central Ethiopia, points to a cluster of maternal and intrapartum factors that sharply increased the odds of puerperal sepsis after childbirth. The pattern is clinically familiar: women entered the postpartum period with reduced physiologic reserve, then faced delivery-related stressors that likely amplified bacterial invasion and impaired recovery.
The study enrolled 495 postpartum women, including 100 cases and 395 controls, using an institutional-based unmatched design from 19 June 2023 to 4 September 2023. Medical charts and face-to-face interviews supplied the exposure data, while adjusted odds ratios were used to separate independent determinants from background noise. In practical terms, the findings identify a postpartum infection profile that is not random. It follows a clear trail through antenatal nutrition, intrapartum complications, and the number of vaginal examinations performed during labor.
Anaemia emerged as the strongest determinant, with an adjusted odds ratio of 6.05. Under an obstetric lens, low hemoglobin means less oxygen delivery, weaker tissue repair, and less physiologic tolerance for blood loss and infection. When the postpartum uterus, perineal tissues, or any trauma from delivery are trying to heal, anaemia leaves the immune system and wound repair machinery underpowered.
Infection risk rose steeply with metabolic, nutritional and obstetric stressors
Undernourishment carried an adjusted odds ratio of 4.43, a finding that fits the biology of maternal immunity. Poor nutritional status weakens barrier function and blunts host defenses at the very moment childbirth creates a vulnerable portal for ascending infection. In settings where food insecurity or limited dietary quality is common, nutritional depletion may not be a background condition; it can become a direct contributor to sepsis risk in the days after delivery.
Gestational diabetes mellitus was associated with an adjusted odds ratio of 3.26. Hyperglycemia impairs neutrophil function, slows tissue repair, and creates an environment in which pathogens can multiply more easily. Even without detailed glucose data in this dataset, the association supports a long-standing clinical concern: metabolic dysregulation in pregnancy often does not end at delivery, and the postpartum period can expose that vulnerability.
Postpartum hemorrhage also increased the odds of puerperal sepsis, with an adjusted odds ratio of 3.17. Severe bleeding can destabilize a mother quickly, but it can also signal retained tissue, prolonged labor trauma, or invasive procedures that open the door to infection. Hemorrhage and infection often travel together rather than as isolated events, and this study reinforces that relationship in a real-world hospital cohort.
Obstructed labor showed a strong association as well, with an adjusted odds ratio of 2.76. Mechanical obstruction can prolong membrane rupture, increase repeated examinations, and intensify tissue injury. Each of those processes can promote bacterial ascension and local contamination. The result is a labor course in which the uterus and lower genital tract face repeated insult before the postpartum period even begins.
Repeated vaginal examinations may have compounded ascending infection risk
Five or more per-vaginal examinations during labor were independently associated with puerperal sepsis, with an adjusted odds ratio of 2.19. This is a direct bedside signal. Every additional examination creates another opportunity for vaginal flora to be introduced into a sensitive reproductive tract, especially when infection-prevention technique is imperfect or labor is already prolonged.
The association does not mean examination is inherently harmful. It means frequency and technique matter. In a labor ward, repeated examinations should have a specific purpose, be performed with strict aseptic measures, and avoid routine repetition when no clinical decision depends on the result. The biological rationale is straightforward: the more often the genital tract is manipulated, the greater the chance of microbial transfer, especially when mucosal integrity is already compromised by obstructed labor or hemorrhage.
Placenta previa also emerged as an independent determinant, with an adjusted odds ratio of 2.27. Placenta previa can complicate delivery with bleeding, intervention, and a higher likelihood of obstetric procedures. Those circumstances may create both direct tissue disruption and a broader exposure to infection. In a postpartum patient, bleeding plus intervention often means more than one risk pathway is active at the same time.
Multiparity was associated with puerperal sepsis, with an adjusted odds ratio of 2.54. The study does not establish a causal mechanism, but the association may reflect cumulative reproductive and obstetric exposure across pregnancies and births, as well as the possibility that multiparous women arrive with a different baseline risk profile. In clinical practice, parity should not be treated as a trivial demographic detail when assessing postpartum infection vulnerability.
Postpartum infection prevention must start before delivery ends
The hospital-based design gives these findings practical relevance for maternity care teams working in similar settings. The determinants were not obscure laboratory markers; they were recognizable clinical conditions encountered daily in labor wards and postpartum units. Anaemia, poor nutrition, hemorrhage, obstructed labor, diabetes, placenta previa, and repeated examinations all sit within the sphere of preventable or modifiable maternal care.
The study’s recommendations follow from that logic. Obstetric providers should adhere strictly to guidance on the number of vaginal examinations performed during labor and apply appropriate infection-prevention technique each time. They should also provide health education on nutrition during pregnancy and the postpartum period, while reinforcing the importance of iron supplementation. Those interventions may appear basic, but they target the same pathways that made infection more likely in this cohort: reduced host defense, more tissue injury, and more opportunities for bacterial entry.
The strongest public health lesson is not abstract. It is that puerperal sepsis can emerge from a sequence of recognizable events long before the diagnosis is made. In East Shoa Zone, the profile included anemia, undernourishment, gestational diabetes, postpartum hemorrhage, obstructed labor, placenta previa, multiparity, and frequent vaginal examinations. Each factor may act differently, but all point toward a postpartum period in which prevention has to begin during pregnancy and continue through labor management and immediate postnatal care.
What remains unmeasured in this study is equally important for interpretation: it does not provide causal proof, and the report does not quantify the exact contribution of each factor beyond the adjusted odds ratios. Even so, the signal is strong enough to guide bedside vigilance. Postpartum women carrying these exposures deserve close surveillance for fever, uterine tenderness, foul-smelling lochia, and other early signs of sepsis so treatment can begin before infection escalates.