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Field observations on the duration of immunity in cattle after vaccination against Anaplasma and Babesia species.

Authors
  • Tjornehoj, K
  • Lawrence, J A
  • Whiteland, A P
  • Kafuwa, P T
Type
Published Article
Journal
The Onderstepoort journal of veterinary research
Publication Date
Mar 01, 1996
Volume
63
Issue
1
Pages
1–5
Identifiers
PMID: 8848296
Source
Medline
License
Unknown

Abstract

In an outbreak of Babesia bovis in a large herd of Friesian x Malawi Zebu cattle, which occurred after an interruption of intensive dipping, clinical or fatal babesiosis occurred in 54/299 (18.1%) animals which had never been vaccinated, as compared to 9/153 (5.9%) vaccinated animals. Eight of the nine affected vaccinates had been vaccinated more than 27 months previously. Sera were collected every 3-4 months from 33 Friesian x Malawi Zebu heifers maintained with intensive dipping and vaccinated with trivalent B. bovis, Babesia bigemina and Anaplasma centrale vaccine. After 2 years, 25% had become seronegative for B. bovis by indirect immunofluorescence, as compared to 97% for B. bigemina and 46% for A. centrale. Because of the evidence that immunity following vaccination against B. bovis declines after 2 years in the absence of tick challenge, it is recommended that tick control should be relaxed after immunity has been established, in order to save acaricide, reinforce immunity and avoid any need for revaccination.

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