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Ecology of Staphylococcus aureus: characterization of strains from chicken
Abstract:
The majority of S. aureus strains isolated from beak-swabs and pathological processes in chicken shows coagulation of human plasma (not of bovine plasma), crystal violet-type A, hemolysine-type A, formation of fibrinolysin, not formation of DNase and reactions with the experimental phage A1591. Because of the absence of DNase-formation and the reaction-specificity for phage A1591 we propose to designate these strains as host-specific variety gallinae of S. aureus. The strains from chicken are compared with strains of human, bovine, and ovine origin. An ecological study in a chicken farm has shown that S. aureus strains from chicken are not found in man and vice versa.
Insights
Staphylococcus aureus strains from chickens exhibit unique characteristics, including specific plasma coagulation and phage reactions, distinguishing them from human and other animal strains. These findings support classifying them as a distinct host-specific variety, gallinae.
Area of Science:
- Microbiology
- Veterinary Science
- Bacteriology
Background:
- Staphylococcus aureus is a significant pathogen in both human and animal health.
- Understanding host-specific strains is crucial for disease control and prevention in livestock.
- Previous research has identified variations in S. aureus strains based on host origin.
Purpose of the Study:
- To characterize Staphylococcus aureus strains isolated from chickens.
- To determine if chicken-derived S. aureus strains are distinct from those found in other animals and humans.
- To propose a specific classification for chicken-associated S. aureus.
Main Methods:
- Isolation and characterization of S. aureus from chicken beak swabs and pathological samples.
- Assays for plasma coagulation (human and bovine), crystal violet binding, hemolysin production, fibrinolysin, and DNase activity.
- Phage typing using experimental phage A1591.
- Comparative analysis with S. aureus strains from human, bovine, and ovine sources.
- Ecological study on a chicken farm to assess host specificity.
Main Results:
- The majority of chicken S. aureus strains coagulated human plasma, exhibited crystal violet-type A and hemolysine-type A, and produced fibrinolysin.
- These strains did not form DNase and showed specific reactions with experimental phage A1591.
- Comparative analysis revealed distinct characteristics compared to human, bovine, and ovine strains.
- An ecological study confirmed the absence of cross-contamination between chicken and human populations on a farm.
Conclusions:
- The unique biochemical and phage reaction profiles of chicken S. aureus strains warrant their designation as a host-specific variety, gallinae.
- This classification aids in understanding S. aureus epidemiology in poultry.
- The study highlights the distinct ecological niches occupied by S. aureus in different hosts, including chickens and humans.