Survey confirms freedom from anaplasmosis

Authors: Durham PJK, Jones DL, MacDiarmid SC
Publication: New Zealand Veterinary Journal, Volume 32, Issue 9, pp 156-157, Sep 1984
Publisher: Taylor and Francis

Animal type: Cattle, Livestock, Production animal, Ruminant
Subject Terms: Protozoa, Disease/defect, Infectious disease, Biosecurity, Parasites - blood borne, Disease surveillance, Epidemiology
Article class: Correspondence

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Abstract: Early in 1983 the Director of the Animal Health Division of MAF learned that anaplasmosis had been diagnosed in a number of New Zealand cattle following their importation into another country. Over a period of 15 months, veterinarians in the importing country had diagnosed anaplasma infection in 16 out of 7290 cattle of New Zealand origin. A survey was considered essential to investigate the possibility that this infection originated in New Zealand. As 10 of the suspect cattle were among 1633 exported from around Te Awamutu in December 1982, the survey concentrated on that area. A survey of 1000 adult cattle was planned. Assuming that the prevalence of suspect cattle amongst those exported (ie, 10/1633 or 0.61%) reflected the prevalence in the area of origin, a survey of this number should have a greater-than 99% probability of detecting at least one infected animal. The properties from which the suspect cattle had been exported were located. Since only one still grazed cattle dating from the time of export, this property, and 16 others which were close neighbours of suspect properties, were surveyed…

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