Newcastle Disease
Newcastle disease (ND) is considered the most important poultry disease worldwide and is one of the major constraints to production of village chickens. Newcastle disease belongs to the same family of viruses that causes measles in humans and distemper in dogs. There are many different strains of ND that can cause a range of clinical signs from sudden death (very virulent strains) to greenish diarrhea (strains with a preference for the gastrointestinal tract), coughing (those with a preference for the respiratory tract) and twisted necks (neurotropic). Many of the clinical signs of ND are indistinguishable from those of avian influenza. This has delayed the detection of outbreaks of highly pathogenic avian influenza, as producers in countries where ND is not controlled are used to seeing high mortality in their chickens.
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