Kansas State University
Agricultural Experiment Station and
Cooperative Extension Service
credit R. Scott Beyer and J.S. Moritz
History and Life-cycle Blackhead disease
There is an old saying that
many producers may be
familiar with, which is that you
cant raise turkeys and chickens
together. We now know that
chickens are carriers of several
diseases that can be transmitted
to turkeys. Blackhead disease
falls under this criterion.
A milder form of this same
disease often occurs in chickens.
Chickens usually do not
fall ill from this disease, but if
infected, can potentially
contaminate facilities. Therefore
rearing chickens and
turkeys in the same facility
should be avoided.
Blackhead is caused by a
single celled organism Histomonas
meleagridis, which damages
the cecal wall of the infected
bird and has the potential to
damage the liver. This organism
can find its way to the bird
by first being ingested by the
common earthworm where it
can survive for long periods of
time. If infected earthworms
are available for flocks of birds
to eat, a Blackhead outbreak
becomes a possibility. Once a
bird internalizes the Blackhead
organism, the organism can
infect a common parasite of the
birds digestive tract, known as
the cecal worm. Cecal worms
produce many microscopic
eggs that also can be penetrated
and infected by the
Blackhead organism.
read more here of this article its a really good read
http://www.oznet.ksu.edu/library/lvstk2/EP69.pdf