Mareks disease is a highly contagious viral disease of poultry characterized bt T cell Lymphomas and peripheral nerve enlargement. standard criteria used for diagnosis include history, clinical signs, gross necropsy, and histopathology.
Being highly contagious mareks are readily transmitted among chickens when fully developed it may be transmitted through feather follicles from which is released into the environment. It may survive for several months in the poultry house litter or dust. infected birds remain carriers for a long time and act as a source of infections for the virus.
Neurological acute infiltration of CNS and nerves which result in paralysis of legs, wings and neck
Visceral - Cause tumours in heart, ovary, tests muscles and even lungs
Cutaneous - tumours of feather follicles
Paralysis of legs , wings and neck
Loss of weight
Grey iris or irregular pupil
the skin around feather follicles become raised and roughened
Control and treatment
Buying chicken from a licenced hatchery that vaccinates their chicks against mareks
There is no effective treatment for Marek's disease
Vaccination is the central strategy for the prevention and control of mareks disease with strict sanitation and biosecurity to reduce or delay exposure