Streptococcus bacteria are gram-positive cocci that typically grow in chains or pairs. Under the microscope, their characteristic spherical shape and tendency to cluster linearly help distinguish them from staphylococci, which form grape-like bunches. These microorganisms are common inhabitants of human skin and mucosal surfaces. While many strains remain harmless commensals, certain species cause severe disease in pregnant women and newborns. Understanding their basic microbiological structure is essential for recognizing how they invade host tissues and evade the immune system.
Microbiologists classify streptococci based on their pattern of haemolysis when grown on blood agar plates. This grouping helps midwives and doctors anticipate the virulence of an infection.
*Streptococcus agalactiae*, commonly known as Group B Streptococcus or GBS, lives naturally in the lower gastrointestinal and female genital tracts. While asymptomatic in most healthy women, colonization during pregnancy poses severe risks. GBS is a leading cause of maternal chorioamnionitis, postpartum endometritis, and urinary tract infections. More critically, vertical transmission during vaginal delivery can cause early-onset neonatal sepsis, pneumonia, or meningitis, making intrapartum antibiotic prophylaxis a life-saving intervention in maternity units.
*Streptococcus pyogenes*, or Group A Streptococcus (GAS), is notorious for causing severe postpartum infections, historically known as childbed fever or puerperal sepsis. Unlike GBS, GAS is rarely a normal commensal; its presence in the reproductive tract usually indicates acquisition from an external source or an active carrier state among healthcare attendants. GAS produces rapid tissue destruction, high fevers, and can quickly escalate into toxic shock syndrome or necrotizing fasciitis if not recognized and treated aggressively.
Diagnosing streptococcal infections requires correlating clinical signs with laboratory confirmation. Pregnant women with urinary tract infections may report dysuria and frequency, while those with chorioamnionitis present with maternal fever, uterine tenderness, and fetal tachycardia. Postpartum women with uterine infections exhibit foul-smelling lochia, pelvic pain, and persistent pyrexia. Midwives must collect high vaginal swabs, endocervical specimens, or blood cultures promptly. Rapid antigen detection tests are also available in some settings, though culture remains the gold standard for accurate identification and sensitivity testing.
Penicillin remains the first-line antimicrobial agent for treating both Group A and Group B streptococcal infections. For penicillin-allergic patients, alternative drugs such as erythromycin or clindamycin are utilized based on local sensitivity profiles. Midwifery management extends beyond administering prescribed intravenous or oral antibiotics. Clinicians must monitor vital signs every four hours, assess lochial discharge for abnormal odour or volume, and evaluate uterine involution. Pain relief, adequate hydration, and psychological reassurance form vital components of comprehensive supportive care during recovery.
Preventing invasive streptococcal disease relies heavily on rigorous hygiene practices and targeted screening protocols. In many antenatal guidelines, women undergo GBS screening between 35 and 37 weeks of gestation. Those who test positive, or have risk factors such as previous GBS-affected infants or intrapartum fever, receive intrapartum antibiotic prophylaxis—typically intravenous penicillin—started at least four hours before delivery. Within the ward, strict handwashing between patients and proper aseptic technique during vaginal examinations remain foundational defences against hospital-acquired streptococcal outbreaks.