Understanding Marek’s Disease in Poultry

Marek’s disease is a highly contagious viral disease affecting the nervous system of chickens. It's caused by a herpesvirus and leads to paralysis, weight loss, irregular pupils, and tumors in organs. Chicks are most vulnerable between 3–6 weeks of age, and the virus spreads via feather dust. There is no cure, only prevention. Vaccinate chicks within 24 hours of hatching. Keep housing clean, dry, and well-ventilated. Avoid mixing vaccinated and unvaccinated birds. Once infected, birds must be culled to prevent the spread. Use personal protective gear during handling. Marek’s can destroy entire flocks and is often misdiagnosed. Regular observation for changes in walking, balance, or posture can help early detection. Keeping stress levels low and avoiding overcrowding reduces susceptibility. Always source chicks from vaccinated flocks to ensure long term safety.