Pathogens associated with houseflies from different areas within a New York State dairy

Area of Science:

• Veterinary Microbiology
• Food Safety
• Entomology

Background:

• Houseflies (Musca domestica) are significant mechanical vectors for various pathogens.
• Understanding the bacterial communities associated with houseflies is crucial for disease control in agricultural settings.

Purpose of the Study:

• To evaluate bacterial communities in houseflies from different dairy farm locations.
• To assess variations in bacterial communities based on fly sex and isolation site (external vs. internal).

Main Methods:

• Collected 101 houseflies from sick pens, calf hutches, and milking parlors.
• Isolated and identified bacterial organisms from external and internal surfaces of the flies.
• Analyzed bacterial diversity and identified species linked to animal health, public health, and milk spoilage.

Main Results:

• A total of 485 bacterial organisms were isolated, with 74% found internally.
• Identified 26 species associated with bovine mastitis, including Staphylococcus aureus and Mycoplasma arginini (a novel finding).
• Isolated five foodborne pathogens (Salmonella spp., Escherichia coli, S. aureus, Bacillus cereus, Bacillus subtilis) and four milk spoilage organisms.

Conclusions:

• Houseflies harbor a high diversity of bacteria, posing risks to animal health.
• The presence of foodborne pathogens and milk spoilage organisms highlights public health concerns.
• Findings underscore the importance of housefly control in dairy farm biosecurity and milk quality management.