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L. L. Callow B.V.Sc. Ph.D. R. J. Parker A.I.M.L.T. 《Australian veterinary journal》1969,45(3):103-104
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F. R. Emmerson> Q.D.A.H. S. G. Knott B.V.Sc. D.A.E. L. L. Callow B.V.Sc. Ph.D.† 《Australian veterinary journal》1976,52(10):451-454
Observations on the use of a vaccine containing Babesia argentina in 5 partly susceptible beef herds in south-eastern Queensland were made on 1,029 female breeding cattle over a period of 4 years. Groups averaging about 20 heifers were given 0, 1, 2 or 3 vaccinations. Incidence derived from groups experiencing clinical attacks were 17.9% for unvaccinated cattle and 1.2% for vaccinates. Increasing the number of vaccinations did not appear to increase protection. The one clinical manifestation of infection with B. bigemina was associated with a concurrent reaction to vaccination with Anaplasma centrale. There were no cases of haemolytic anaemia in new-born calves. No severe reactions followed primary vaccination, but 2 revaccinated animals became sick. 相似文献
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L. L. Callow B.V.Sc. Ph.D. F. R. Emmerson Q.D.A.H.† R. J. Parker A.I.M.L.T. S. G. Knott B.V.Sc. Dip. Agr. Ext.† 《Australian veterinary journal》1976,52(10):446-450
Serums from unvaccinated groups in 5 herds of beef-cattle in South-East Queensland were tested for antibodies to Babesia argentina at intervals while the cattle were increasing in age from about 6 months. An indirect fluorescent antibody test was used. Infection rates, indicating the proportions of the groups that had been exposed to tick-transmitted infection were 49.2, 56.9 and 69.1% for cattle aged approximately 6, 12 and 18 months, respectively. The degree to which cattle were infested with the vector, Boophilus microplus, was estimated. There appeared to be a strong correlation between infection rate and tick incidence. Four serologically negative animals died of either confirmed or suspected babesiosis during the sampling period. Sickness was observed in 5 others. The serological status of 57 changes from negative to positive without symptoms being observed, indicating relatively low mortality and morbidity rates in the enzootic situation studied. 相似文献
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