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Use the chart below to determine if you have high risk contact with outside herds.

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1Some grazing communities have Trich management plans in place to aid in the prevention of Trich. 

2 High risk neighbors include breeding age cattle with an unknown owner, a herd with no defined calving season, an unstable herd population (i.e. trader cows), or a herd with a history of Trich infection.  All other herds would be considered low risk. 


Abbit et. al., Vet Med, 1979.  Campbell et. al., Canada Vet J 1993. Clark et. al., Aus Vet J, 1983.  Dennet et. al., Aus Vet J, 1974.  Johnson et. al., JAVMA 1964.  Mardones et. al., Vet Parasit, 2008.  Mendoza-Ibarra et. al., Vet J 2013.  Riley et. al., J of Clin Micro, 1995.  Skirrow et. al., JAVMA, 1987.  Soto et. al., Vet Parasit, 1989.  Stewart et. al., Canada Vet J, 1998.