Disease properties: It happens at every age, when the animal is stressed or during season changes. It occurs very fast in the herd and has a high death rate. Duck is suddenly death, congestion is presented at necropsy.  

Etiology It is caused by avian influenza virus H5N1 Virus resistance The virus could easily be killed by antiseptics and bleaching agents.

Marek's disease is a highly contagious disease caused by Gallid herpesvirus 2 (GaHV-2) in chickens. Morbidity is 10-50% and mortality up to 100%. Quail and turkey are also infected with the disease. Other species of birds and mammals are not infected with Marek’s disease.

The avian influenza outbreak occurred in mid 2003 in South East Asia was the biggest and most serious one. The pathogen was confirmed to be A/H5N1 virus and there were 150 millions of birds being destroyed. While A/H5N1 virus was still an aggressive pathogen in Indonesia, Vietnam, Combodia, China, Thailand, and...

Chronic Respiratory Disease (CRD) in poultry has some common symptoms such as: wheezy breathing, face swelling. This is typical disease in poultry in transition season, occurs in all ages. Chickens in 3-6 weeks of age and laying hens, however, are more susceptible than other group of ages.