Marek’s disease is a highly contagious viral illness that affects chickens. Caused by Marek’s Disease Virus (MDV), this condition can lead to tumours, paralysis, immune suppression, and death. There is currently no cure, which is why Bird Vet Melbourne strongly recommends vaccinating chicks before any exposure to the virus.
Marek’s disease is caused by a chicken-specific herpesvirus. It spreads rapidly in flocks, especially in close quarters or where hygiene is poor.
The virus is shed in feather dust, skin dander, and droppings. Once introduced to an environment, it can persist for long periods. Birds exposed to the virus may not show symptoms for weeks or months.
Once the virus is present in a flock, control is difficult without vaccination.
The Marek’s vaccine is the most effective way to protect chickens. It should be administered within the first 24 hours after hatching and before any potential virus exposure. Vaccination helps reduce the severity and spread of the disease but does not eliminate the virus entirely.
Certain chicken breeds are naturally more resistant to Marek’s disease. While vaccination is still recommended, selecting birds from resistant lines can offer some additional protection. Note that even resistant birds can become carriers and spread the virus to others.
If you notice symptoms such as paralysis, weakness, or rapid weight loss in your chickens, contact Bird Vet Melbourne as soon as possible. Prompt veterinary advice can help reduce losses and limit disease spread.
A clinical exam may suggest Marek’s, but confirmation usually requires post-mortem testing. This includes laboratory analysis of organs like the liver, spleen, and sciatic nerve to detect Marek’s-related tumours.
We offer Marek’s vaccination for day-old chicks, as well as expert support for poultry health. Whether you're managing a backyard
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