Household risk factors for colonization with multidrug-resistant Staphylococcus aureus isolates

Area of Science:

• Infectious Diseases
• Clinical Microbiology
• Epidemiology

Background:

• Antimicrobial resistance, especially from methicillin-resistant Staphylococcus aureus (MRSA), poses significant challenges in healthcare, limiting treatment options and increasing costs.
• Understanding patient risk factors for multidrug-resistant MRSA colonization is crucial for effective infection control.

Purpose of the Study:

• To investigate patient risk factors, including household and animal contact, associated with multidrug-resistant MRSA colonization in a rural tertiary care hospital.
• To compare resistance patterns and identify predictors of MRSA colonization.

Main Methods:

• A prospective study of 88 MRSA-colonized patients admitted to a rural tertiary care hospital between 2009-10.
• Patient interviews were conducted to gather data on risk factors; antimicrobial resistance patterns of MRSA isolates were tested.
• Results were compared with NHANES 2003-04 data.

Main Results:

• High prevalence (73%) of multidrug resistance in MRSA nasal isolates was observed.
• Multidrug resistance was associated with a 1.5-day increase in length of stay (p = 0.008).
• Recent hospitalization (within six months) was linked to resistance patterns, while animal contact showed potential association in specific patient subsets.

Conclusions:

• Recent hospitalization is a significant predictor of antimicrobial resistance in MRSA isolates.
• Emerging household-related risk factors, such as animal contact, may be associated with community-associated MRSA (CA-MRSA).
• Understanding these drivers is vital for hospital infection control, patient outcomes, and managing the economic impact of antimicrobial resistance.