Postpartum infections, also known as puerperal infections, are infections that occur in women during the postpartum period, which extends from the onset of labor through the first six weeks after delivery. These infections can affect various anatomical sites, including the uterus, perineal tissues, surgical incision sites (e.g., after cesarean delivery), urinary tract, breast tissue, and systemic circulation.
Classification and Common Types
| Type of infection | Typical onset (days postpartum) | Primary anatomic site | Common causative organisms |
|---|---|---|---|
| Endometritis (uterine infection) | 2–5 | Endometrium (uterine lining) | Streptococcus spp., Escherichia coli, Bacteroides spp., anaerobes |
| Perineal wound infection (including episiotomy or laceration) | 3–10 | Perineal soft tissue | Staphylococcus aureus, Streptococcus spp., mixed flora |
| Surgical site infection (post‑cesarean) | 5–14 | Abdominal incision | Staphylococcus aureus, Enterococcus spp., gram‑negative bacilli |
| Urinary tract infection (UTI) | 1–7 | Bladder, urethra | E. coli, Klebsiella spp., Proteus spp. |
| Mastitis (breast infection) | 7–14 | Breast tissue, ducts | Staphylococcus aureus (including MRSA), Streptococcus spp. |
| Sepsis (systemic infection) | Variable | Bloodstream (origin may be uterine, wound, urinary) | Polymicrobial, often gram‑negative rods and anaerobes |
Epidemiology
- Global incidence varies widely, estimated at 0.5–5% of all deliveries in high‑income countries and up to 10% in low‑resource settings.
- Higher rates are associated with cesarean delivery (≈5–10% for endometritis) compared with vaginal delivery (≈1–2%).
- Mortality from postpartum infections has declined in high‑resource settings but remains a leading cause of maternal morbidity and mortality in many low‑ and middle‑income countries.
Risk Factors
| Category | Specific risk factors |
|---|---|
| Obstetric | Cesarean section, prolonged labor, multiple vaginal examinations, operative vaginal delivery, retained placenta, premature rupture of membranes (PROM) |
| Maternal | Pre‑existing infection, anemia, diabetes mellitus, obesity, immunosuppression (including HIV), malnutrition |
| Procedural | Inadequate aseptic technique during delivery or surgery, use of contaminated instruments, prophylactic antibiotic omission |
| Environmental | Overcrowded or unhygienic birthing environments, limited access to clean water and sanitation |
Clinical Presentation
- Fever (≥38 °C) persisting beyond 24 h after delivery, often with chills.
- Uterine tenderness, foul‑smelling lochia (post‑delivery discharge).
- Localized pain, swelling, erythema, or purulent discharge at episiotomy, perineal laceration, or cesarean incision sites.
- Dysuria, urgency, or suprapubic pain indicating UTI.
- Breast pain, redness, swelling, and possible systemic signs (fever) in mastitis.
- Signs of systemic infection or sepsis: tachycardia, hypotension, altered mental status, organ dysfunction.
Diagnostic Evaluation
- Clinical assessment – vital signs, inspection of the genital tract, incision sites, breast, and urinary symptoms.
- Laboratory tests – complete blood count (leukocytosis), C‑reactive protein or procalcitonin (inflammatory markers), blood cultures if sepsis suspected.
- Microbiological sampling – cultures from lochia, wound discharge, urine, or breast milk as indicated.
- Imaging – pelvic ultrasound for retained products, CT or MRI if deep pelvic or abdominal infection is suspected.
Management
- Empiric antimicrobial therapy initiated promptly, tailored to the most likely pathogens and local resistance patterns. Common regimens include:
- Endometritis: clindamycin + gentamicin or ampicillin‑sulbactam.
- Cesarean‑related infection: cefazolin (or ceftriaxone) plus metronidazole; broadened if MRSA risk.
- UTI: nitrofurantoin or trimethoprim‑sulfamethoxazole, adjusted for pregnancy/post‑partum safety.
- Mastitis: anti‑staphylococcal agent such as dicloxacillin; consider MRSA coverage when risk factors present.
- Source control – drainage of abscesses, surgical debridement of necrotic tissue, removal of retained products.
- Supportive care – fluid resuscitation, analgesia, and monitoring for organ dysfunction.
- Duration – typically 7–10 days for uncomplicated infections; longer courses for deep or recurrent infections.
Prevention Strategies
- Antibiotic prophylaxis – a single dose of a first‑generation cephalosporin (e.g., cefazolin) administered within 60 minutes before skin incision for cesarean delivery reduces endometritis risk.
- Aseptic technique – strict hand hygiene, sterile gloves, and equipment sterilization during labor, delivery, and surgical procedures.
- Optimal labor management – minimizing multiple vaginal examinations, reducing prolonged rupture of membranes, and employing active management of the third stage of labor.
- Post‑delivery care – education on perineal hygiene, breast care (proper latch, breast emptying), and prompt attention to any signs of infection.
- Vaccination – tetanus immunization for pregnant women in regions where tetanus remains a risk.
Historical Context
Postpartum infections have been recognized since antiquity. The term “puerperal fever” was famously described by Ignaz Semmelweis in the mid‑19th century, who demonstrated that hand‑washing with chlorinated lime dramatically reduced mortality among obstetric patients. Semmelweis’ work laid the foundation for modern infection control practices in obstetrics.
Outlook
With adherence to evidence‑based preventive measures and timely treatment, the majority of postpartum infections are curable without lasting sequelae. Ongoing challenges include antimicrobial resistance, disparities in health‑care access, and the need for improved surveillance in low‑resource settings.
