References
- MacDonald , N.R. and Rudge , J.M. 1957 . Prevention of leptospirosis in young calves by vaccinating their dams in late pregnancy . N.Z. Vet. J. , 5 : 83 – 92 .
- Mackintosh , C.G. , Marshall , R.B. and Thompson , J.C . 1981 . Experimental infection of sheep and cattle with Leptospira interrogans serova balcanica . N.Z. vet. J. , 29 : 15 – 19 .
- Mackintosh , D.G. , Marshall , R.B. and Broughton , E.S . 1980 . The use of a hardjo-pomona vaccine to prevent leptospiruria in cattle exposed to natural challenge with Leptospira interrogans serovar hardjo . N.Z. vet. J. , 25 : 174 – 177 .
- Marshall , R.B. , Broughton , E.S. and Hellstrom , J.S. 1979 . Protection of cattle against natural challenge with Leptospira interrogans serovar hardjo using a hardjo-pomona vaccine . N.Z. vet. J. , 27 : 114 – 116 .
- Ris , D.R. and Hamel , K.L. 1979 . Leptospira interrogans serovar pomona vaccines with different adjuvants in cattle . N.Z. vet. J. , 27 : 169 – 171 .
- United States Department of Agriculture Standard requirement B-20: Standard Requirement for Leptospira pomona Bacterin Veterinary Services. Animal and Plant Health Inspection Service U.S.D.A. Washington D.C 1970