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Newcastle disease (ND) is one of the most important infectious diseases of poultry. It is distributed worldwide and has the potential to cause large economic losses in the poultry industry (Lancaster, 1976 and Spradbrow, 1988). Its causative agent is Newcastle disease virus (NDV), a virus that is able to infect over 240 species of birds and which spreads primarily through direct contact between infected and healthy birds (Kaleta and Baldauf, 1988).

Comparative Study between HI and Indirect ELISA Antibody Titres in Samples for NDV Virus in Poultry