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[Possibilities of Marek's disease transmission by dust in contaminated hatcheries]
Abstract:
A short-term test in vivo was performed with dust collected in hatcheries on a contaminated farm. The results proved the presence of infective agents of Marek's disease (MN) in the dust. The chickens hatched in these hatcheries and taken to disease (MN) in the dust. The chickens hatched in these hatcheries and taken to a disease-free environment also showed microscopic MN-specific changes. In the set of 50 chickens of the Leghorn White (LW) breed, line 44, infected aerogenically with the dust from hatcheries, MN-specific changes were found in 26 birds, i. e. in 52.0%. The non-infected control birds were MN-negative. In the set of 182 White Cornish X White Plymouth (WC X WP) hybrid chickens, hatched in contaminated hatcheries, MN-specific changes were observed in 41 birds, i. e. in 22.5% of the chickens tested.
Insights
Marek's disease (MD) infective agents were found in hatchery dust. Chickens exposed to this dust showed MD-specific changes, indicating environmental contamination risk.
Area of Science:
- Veterinary Virology
- Poultry Pathology
- Environmental Microbiology
Context:
- Hatcheries on contaminated farms can harbor infectious agents.
- Poultry dust is a potential vector for disease transmission.
- Marek's disease (MD) poses a significant threat to poultry health and industry.
Purpose:
- To investigate the presence and infectivity of Marek's disease (MD) agents in hatchery dust.
- To assess the risk of aerogenic transmission of MD from contaminated dust to chickens.
- To determine the susceptibility of different chicken breeds to MD via dust exposure.
Summary:
- Infective agents of Marek's disease (MD) were identified in dust from contaminated poultry hatcheries.
- Chickens (Leghorn White and White Cornish X White Plymouth hybrids) exposed to this dust via inhalation developed MD-specific microscopic changes.
- Infection rates varied by breed, with 52.0% of Leghorn Whites and 22.5% of hybrid chickens showing pathological signs.
Impact:
- Demonstrates that hatchery dust can be a source of Marek's disease (MD) infection.
- Highlights the importance of biosecurity and environmental control in hatcheries to prevent disease spread.
- Provides evidence for breed-specific susceptibility to aerogenic MD transmission, informing disease management strategies.