Studies upon the basic characteristics of avian paramyxovirus type 1 strains, isolated from pigeons in Bulgaria
2002
Hadjiev, G. (National Diagnostic Veterinary Medical Institute, Sofia (Bulgaria))
Pigeons strains showed a high agglutination activity against chick erythrocytes and their haemagglutinins were stable at 56 degree C. NDV-sensitive chickens, aged 5-8 weeks, inoculated intramuscularly, intravenously, intracloacally or intraconjunctivally with local A/PMV-1 strains, obtained from pigeons as well as non-infected chickens from the same batch, put in contact with infected ones, developed an occult infection. Both inoculated and contact chickens underwent an immunological transformation - they reacted with formation of high titres of specific serum antibodies that protected them from disease or death after challenge with a definitely lethal dose of a velogenic-viscerotropic NDV strain. Our previous studies upon Bulgarian A/PMV-1 strains isolated from pigeons did not suggest that they were really dangerous for poultry health by respect to Newcastle disease.
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