caa a22 4500 465744427 CHVBK 20180323111816.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1007/BF02240411 doi (NATIONALLICENCE)springer-10.1007/BF02240411 Protection conferred by vaccination with Blacksburg and Komarov strains of Newcastle disease virus against Newcastle disease in Bangladesh [Elektronische Daten] [MD Saifuddin, T. Chowdhury, A. Sarker, M. Amin] Protection Conferee Contre La Maladie De Newcastle Au Bangladesh Par La Vaccination A L'Aide Des Souches Blacksburg Et Komarov De Virus De La Maladie De Newcastle Summary: An evaluation was undertaken of the efficacy of vaccination of day-old chicks with the Blacksburg (B1) strain of Newcastle disease virus (NDV) followed at various times by vaccination with the Komarov (K) strain. Antibody was detected by the haemagglutination inhibition (HAI) test one week after vaccination with B1 and titres peaked at three weeks and had declined to undetectable levels by nine weeks. After subsequent vaccination with K strain at five, seven or eight weeks of age levels of HAI antibody (titre 80 to 640) were detected after three weeks. Birds vaccinated at seven weeks were tested for antibody and resistance to challenge beyond 19 weeks of age. In this group the HAI titres remained constant (80 to 640) up to 32 weeks of age and then steadily declined to 10 to 20 at 44 weeks of age. A linear relationship between HAI titre and virus neutralising index (VNI) was demonstrated with a range of selected sera. Only birds with an HAI titre of 80 or greater resisted artificial challenge. It is recommended that, following B1 vaccincation at day-old and K vaccination at seven weeks old, revaccination with K strain should be performed at intervals of not more than seven months. Centre for Tropical Veterinary Medicine, 1990 Saifuddin MD Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh aut Chowdhury T. Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh aut Sarker A. Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh aut Amin M. Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh aut Tropical Animal Health and Production Kluwer Academic Publishers-Human Sciences Press 22/4(1990-12-01), 263-272 0049-4747 22:4<263 1990 22 11250 https://doi.org/10.1007/BF02240411 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02240411 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Saifuddin MD Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh aut NATIONALLICENCE 700 1- Chowdhury T. Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh aut NATIONALLICENCE 700 1- Sarker A. Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh aut NATIONALLICENCE 700 1- Amin M. Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh aut NATIONALLICENCE 773 0- Tropical Animal Health and Production Kluwer Academic Publishers-Human Sciences Press 22/4(1990-12-01), 263-272 0049-4747 22:4<263 1990 22 11250 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer