For what it's worth. This according to Practical Poultry magazine. Of course I couldn't type the entire article but I did share this on the New York Chicken lovers thread.
There are four recognized and relatively common forms of Marek.
It's caused by various types of herpes virus.
Marek virus is contagious and can survive for several months. As a rule chickens will be infected early in life
A bird may die from other causes before the presence of Marek becomes apparent. A knock on consequence of the virus is that it suppresses the sufferers immunity, with the result thce of Marek's even becomes apparent. (This says to me that one can have Mareks in the flock and not even know it.)
Favorites among the potential causes of trouble are COCCIDOSIS AND EGG PERITONITIS. (interesting when you think you have coccidosis but don't suspect the route cause is Marek.)
The infectious virus is shed from the feather follicles and then gets inhaled. (This tells me to beware of the dust I have in my coop. I have to buy a small shop vac and keep dust to a minimum. Also to improve ventilation)
Age is a key factor in susceptibility, too. While the disease can affect birds ranging from just two weeks old right up to examples that are five years old, IT WILL MOST OFTEN STRIKE WITHIN THE FIRST YEAR OF LIFE, TYPICALLY FROM ABOUT FOUR MONTHS ONWARDS.
There are four recognized and relatively common forms of Marek.
It's caused by various types of herpes virus.
Marek virus is contagious and can survive for several months. As a rule chickens will be infected early in life
A bird may die from other causes before the presence of Marek becomes apparent. A knock on consequence of the virus is that it suppresses the sufferers immunity, with the result thce of Marek's even becomes apparent. (This says to me that one can have Mareks in the flock and not even know it.)
Favorites among the potential causes of trouble are COCCIDOSIS AND EGG PERITONITIS. (interesting when you think you have coccidosis but don't suspect the route cause is Marek.)
The infectious virus is shed from the feather follicles and then gets inhaled. (This tells me to beware of the dust I have in my coop. I have to buy a small shop vac and keep dust to a minimum. Also to improve ventilation)
Age is a key factor in susceptibility, too. While the disease can affect birds ranging from just two weeks old right up to examples that are five years old, IT WILL MOST OFTEN STRIKE WITHIN THE FIRST YEAR OF LIFE, TYPICALLY FROM ABOUT FOUR MONTHS ONWARDS.