1
Virulent Newcastle disease is caused by
(A) . Velogenic strains
(B) . Enteric pathotype strains
(C) . Mesogenic strains
(D) . Lentogenic strains
Choose the correct answer from the options given below:
EXPLANATION
Avian Paramyxovirus & Birnavirus Infections
- Pathotypes of Newcastle Disease Virus (Avian Paramyxovirus-1):
- Classified based on pathogenicity indices (MDT, ICPI, IVPI):
- Velogenic Strains: Highly virulent, causing severe fatal Newcastle disease ($90-100\%$ mortality; viscerotropic or neurotropic).
- Mesogenic Strains: Moderately virulent, causing acute respiratory disease, neurological signs, and egg drop (used as secondary booster vaccines).
- Lentogenic Strains: Low-virulence, causing mild subclinical respiratory infection (used as primary live vaccines, e.g., LaSota, F-strain).
- Hence, virulent disease is caused by velogenic and mesogenic strains.
- nalysis:
- ((A) and (C) only): Correct.
Correct option: (3) (A) and (C) only.
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