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[Epidemics of Staphylococcus aureus in a neonatal care unit]
Abstract:
The work describes an epidemic infection by Methicillin-Resistant S. aureus in a N.I.C.U. which took place during the first six months of 1986. Hospital systemic infection supported by M.R.S.A. are frequently noticed in N.I.C.U. This is related, on the one side with a selection of antibiotic resistant bacterial strains inside the hospital premises and, on the other side with increased survival of high infectious risk neonates who are subjected to invasive medical manoeuvres. The cases reported include 7 neonates (5 of which were preterms) who were affected by a severe sepsis. From an epidemiological study it appeared that M.R.S.A. strain was introduced in N.I.C.U. by a neonate coming from the surgery after being operated for a diaphragmatic hernia. The isolation and the treatment of the carriers, the severe asepsis and the systematic disinfection of the Unit made it possible to eradicate the infectious strain. The infected neonates have been treated with an aimed antibiotic therapy, especially with Vancomycin, administration of blood and/or fresh plasma and/or immunoglobulins and/or concentrated granulocytes. The outcome was favourable for 3 neonates; of the others, 1 showed post-infectious neurological sequelae and 3 died (they were however affected by other severe associated diseases).
Insights
A Methicillin-Resistant Staphylococcus aureus (MRSA) epidemic in a NICU was controlled through isolation, asepsis, and disinfection. Targeted therapies improved outcomes for some neonates, but mortality remained high in severely ill infants.
Area of Science:
- Neonatal Medicine
- Infectious Diseases
- Hospital Epidemiology
Background:
- Neonatal Intensive Care Units (NICUs) are prone to hospital-acquired infections, particularly antibiotic-resistant strains like Methicillin-Resistant Staphylococcus aureus (MRSA).
- Increased survival rates of high-risk neonates undergoing invasive procedures contribute to the prevalence of such infections.
- MRSA infections in NICUs can lead to severe sepsis with significant morbidity and mortality.
Purpose of the Study:
- To describe an epidemic of MRSA infection in a NICU.
- To identify the source and transmission route of the MRSA strain.
- To evaluate the control measures and treatment outcomes.
Main Methods:
- Epidemiological investigation to trace the MRSA strain's origin.
- Implementation of strict infection control measures: isolation of carriers, enhanced asepsis, and unit disinfection.
- Treatment of infected neonates with targeted antibiotics (e.g., Vancomycin), blood products, and immunotherapies.
Main Results:
- Seven neonates developed severe sepsis due to MRSA, with 5 being preterm infants.
- The MRSA strain was traced to a neonate admitted after surgery for a diaphragmatic hernia.
- Infection control measures successfully eradicated the MRSA strain from the NICU.
- Treatment outcomes varied: 3 neonates recovered fully, 1 had neurological sequelae, and 3 died (all with severe comorbidities).
Conclusions:
- Prompt identification and isolation of carriers, coupled with rigorous infection control, are crucial for eradicating MRSA outbreaks in NICUs.
- While targeted therapies can improve outcomes, the prognosis for neonates with severe MRSA sepsis remains guarded, especially in those with co-existing critical illnesses.
- This case highlights the persistent challenge of antibiotic resistance in neonatal intensive care settings and the importance of comprehensive infection prevention strategies.