Newcastle disease is a highly contagious and often severe disease found world wide that affects birds including domestic poultry. The disease appears in three forms: lentogenic or mild, mesogenic or moderate and velogenic or very virulent, also called exotic Newcastle disease. It usually presents as a respiratory disease, but depression, nervous manifestations, or diarrhoea may be the predominant clinical form. The disease is frequently responsible for devastating losses in village poultry since most of these birds are not subjected to routine vaccination. In this book, we...

Leptospirosis, a zoonoses with a worldwide distribution, is an acute febrile illness caused by spirochaetes of the pathogenic Leptospira. It affects a wide range of hosts including human, domestic and wild animal species. It is mostly present in tropical countries. The disease is often misdiagnosed as influenza, aseptic meningitis, encephalitis, dengue fever, hepatitis, or gastroenteritis. In domestic animals it is a disease of major economic importance as it affects productivity and results in weakness, abortion or even death. Timely diagnosis is essential because prompt, specific...