Studies on the Immunogenic Properties of Three Lentogenic Strains of Newcastle Disease Virus
نویسنده
چکیده
The HI and SN titers produced by V2 (Laso ta Vaccine, chick-embryo origin) were more than VI (TCND) and V3 (Lasota tissue culture origin) vaccines. High percentage (96,%, 93,% & 90,%) of the three subgroup hens, when vaccinated with VI, V2 and V3 respectively, were found resistant to contact exposure challenge with 2 x 10 6 ELD 50 of virulent NDV Zabol strain. The egg production dropped slightly (three to 4%) in vaccinated hens when they were challenged by contact exposure with 2 x 106 ELD 50 of the virulent NDV Zabol strain. In unvaccinated hens the egg production fell more rapidly· They succumbed to ND within a few days. No clinical signs Cou Id be seen in chic kens vaccinated with BI (Hitchner) and TCND (Bankowski). However those groups vaccinated with Lasota vaccines (V2-V3) developed signs of a general depressionand raIes. Three cases ofparalysis and one oftorticollis were also observed.
منابع مشابه
Studies on the immunogenic properties of three lentogenic strains of newcastle disease virus
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