VMC-0063
QUESTION
Which one is the mesogenic vaccine strain of Newcastle Disease Virus?
OPTIONS
(A) LaSota
(B) R2B
(C) Hitchner B1
(D) F (F1)
ANSWER
(B) R2B
EXPLANATION
R2B (Mukteswar strain) is a mesogenic strain of Newcastle Disease Virus, characterized by moderate virulence and used for vaccination of older chickens. LaSota, Hitchner B1, and F (F1) are lentogenic strains with low virulence, commonly used for primary vaccination. Therefore, R2B is the only mesogenic strain among the given options.
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