Table 1.

Viruses used in the study

Virus	Strain	Source
Peste des petits ruminants virus (PPRV)	AR 87 vaccine strain	Dept. of Vet. Microbiology, Madras Veterinary College
	Sunguri vaccine strain	Indian Immunologicals Ltd, Bangalore
	Coimbatore vaccine strain	Dept. of Animal Biotechnology, Madras Veterinary College
	Coimbatore field isolate	Dept. of Vet. Microbiology, Madras Veterinary College
	Recent field isolates	Dept. of Vet. Microbiology, Madras Veterinary College
Canine distemper virus (CDV)	Vaccine strain	Nobivac Puppy DP, Intervet
Measles virus (MV)	Vaccine strain	Serum institute of India LTD, Pune
Bluetongue virus (BTV)	Vaccine strain	Dept. of Vet. Microbiology, Madras Veterinary College
Newcastle disease virus (NDV)	D58	Dept. of Vet. Microbiology, Madras Veterinary College