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[Pathogenicity of methicillin resistant Staphylococcus aureus. In vitro study]
Schweizerische Medizinische Wochenschrift
|December 4, 1976
Summary
Methicillin-resistant Staphylococcus aureus (MRSA) strains exhibit greater survival against human immune cells (polymorphonuclear leukocytes) in laboratory tests. This enhanced pathogenicity is independent of their antibiotic resistance levels.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Context:
- Assessing the pathogenicity of methicillin-resistant Staphylococcus aureus (MRSA) is challenging using traditional clinical or epidemiological data.
- Polymorphonuclear leukocytes (PMN) are crucial in combating S. aureus infections, making them ideal for in vitro pathogenicity studies.
Purpose:
- To evaluate the in vitro pathogenicity of methicillin-resistant (MR) S. aureus strains compared to methicillin-sensitive (MetS) strains using a phagocytic assay.
- To determine if increased antibiotic resistance influences the pathogenic potential of MR strains.
Summary:
- An in vitro phagocytic assay was conducted using isolated PMN to compare the survival rates of MR and MetS S. aureus strains.
- MR strains demonstrated significantly better survival against PMN phagocytosis than MetS strains after 30 and 60 minutes of incubation.
- Amplifying antibiotic resistance in three MR strains did not alter their survival rates in the phagocytic assay.
Impact:
- Methicillin-resistant S. aureus strains possess inherent pathogenic potential.
- The level of methicillin resistance does not appear to affect the intrinsic pathogenicity of S. aureus strains in this phagocytic model.