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Updated: Sep 8, 2025
Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
Published on: February 9, 2011
Risk Factors Associated with Methicillin Resistance in Hospitalized Newborn Infants with Staphylococcus aureus
Jia Wei1, Yin Wang2, Chao Chen3
1Department of Psychological Medicine, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, People's Republic of China.
Insights
Prior antibiotic use increases methicillin-resistant Staphylococcus aureus (MRSA) risk in newborns, while exclusive breastfeeding offers protection. Understanding these factors aids in selecting appropriate empirical antibiotics for neonates.
Area of Science:
- Neonatal infections
- Infectious diseases
- Public health
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) infections are a growing global concern.
- Neonatal S. aureus infections require understanding risk factors for effective treatment.
Purpose of the Study:
- To identify risk factors for methicillin-resistance in neonates with S. aureus infections.
- To guide empirical antibiotic selection for neonatal S. aureus infections.
Main Methods:
- Comparison of hospitalized neonates with MRSA versus methicillin-sensitive S. aureus (MSSA) infections.
- Multivariable regression analysis to determine independent risk factors for neonatal MRSA acquisition.
Main Results:
- MRSA infections led to longer hospitalizations and higher costs compared to MSSA.
- Prior antibiotic use (>48 hours) was an independent risk factor for MRSA.
- Exclusive breastfeeding was a significant protective factor against MRSA acquisition.
Conclusions:
- Restricting antibiotic misuse and promoting breastfeeding can prevent neonatal MRSA.
- Antibiotic history and breastfeeding status are crucial for empirical antibiotic choices in neonates.
Background:
An increasing number of infections due to methicillin-resistant Staphylococcus aureus (S. aureus) have been reported worldwide. To explore the risk factors associated with methicillin-resistance among the neonates with confirmed S. aureus infections and thereby to help selection of appropriate empirical antibiotics.
Methods:
We compared a group of hospitalized neonates with culture confirmed methicillin-resistant S. aureus (MRSA) infections to a group with methicillin-sensitive S. aureus (MSSA) based on antimicrobial susceptibility reports. We used multivariable regression analysis to determine the risk factors for neonatal MRSA infections.
Results:
There was no difference in the ratio of local to systemic infections or mortality between the two groups. However, the total hospitalization days and the medical care expenses in the MRSA group were significantly increased when compared to that of the MSSA group. Prior use of antibiotics for more than 48 hours was an independent risk factor for neonatal acquisition of MRSA infections, while exclusive breast milk feeding was a protective factor against MRSA infections.
Conclusion:
Restrictions on antibiotic abuse and promotion of breast milk feeding may protect newborns from MRSA infections. Prior history of antibiotic use and exclusive breast milk feeding may be important factors to consider in the selection of appropriate empirical antibiotics for use in neonates prior to the availability of the results of antimicrobial susceptibility testing.
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