Marek's disease

 

Introduction : 

• Marek's disease ia a lymphoproliferative disease of chickens, caused by herpes virus and characterized by a mono-nuclear infiltration of peripheral nerves, gonads, iris, various viscera, muscle and skin.

Duck plague.

 

Introduction : 

• Duck plague is an acute contagious viral disease of duck, geese and swans, caused by Herpesvirus (duck virus enteritis).

• Differences in virulence among DEV strains have been noted but all appear immunologically identical.

• Naturally occurring infection has been occurred in ages ranges from 7-day old ducklings to mature breeder ducks.

Ranikhet disease

 

Introduction :

• Ranikhet disease, also known in the West as Newcastle disease. Newcastle disease is an infectious several virus disease of birds, caused by Paramyxovirus 1 and characterized by characteristic respiratory, alimentary and nervous signs.

Avian pox

 

Introduction :

Avian pox is a slow spreading common virus disease for birds, characterized by mainly two forms 1. mild form and 2. Severe form. It has a worldwide distribution ans has been described in more than 60 species of birds representing some 20 families, as will as in caged birds.