I found this info on another websight. I'm not sure what the treatment(seems they are preventative rather than cure) is by reading this and other articles or even if there is one.
Black head
Blackhead (Histomoniasis, Enterohepatitis)
Birds affected
Birds affected are: turkeys, peafowl, guinea fowl, pheasant and chickens
Blackhead is an acute or chronic protozoan disease of fowl, primarily affecting the cecae and liver. called Histomonas meleagridis
The disease is present wherever poultry are raised
It is a parasite organism called a protozoa, and is a distant cousin of the coccidia parasite
For the disease to spread amongst fowl the flock must also be infected with the caecal worm
This worm survives in the fowl yard soil, earthworms
This disease affects the large intestine, then attacks the liver
The chooks bowl is eaten by the parasite and then it attacks the liver
When the chooks die their heads go black, hence the name
Turkeys:
Blackhead is one of the critical diseases of growing turkeys and game birds
It is carried by an intestinal parasite and the symptoms are:- loss of condition, drowsy appearance, ruffled feathers, and diarrhoea, sometimes mixed with blood.
It may cause stunted growth, poor feed utilization and death.
It is of lesser economic importance in chickens since they are more resistant, but the incidence in chickens apparently is increasing
Occasionally the caruncles of the turkey may become dark blue or purple (hence the name black head)
If you have an outbreak, dead birds and their droppings must be burned
All utensils should be disinfected daily and, where possible, quick lime should be applied to the run
To prevent an outbreak, Turkeys should not be run with fowls, and young turkeys should not be run in contact with adult birds
If this is not possible, then chicks and hens should be kept on clean dry, well-drained pasture and move about frequently
Symptoms
Birds develop foamy yellow diarrhoea and sit huddled up
They appear depressed and ill
They stop eating and get very thin
Increased thirst
Droopiness
Drowsiness
Darkening of the facial region
The birds can be so ill, that their wattle and comb goes blue (thus the name blackhead)
If not treated the birds usually die
Any sulphur coloured foamy droppings should be considered as blackhead, even if the bird is not showing any other signs of the disease
Blackhead acts as an immune suppressor, which will allow other diseases to have greater effect on your birdâs health
It may cause stunted growth
