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Abstract

The occurrence of endemic stability for heartwater is a controversial issue, because the means by which young cattle and other neonatal ruminants become infected and acquire immunity to the disease have never been adequately explained. A study was conducted in a heartwater-endemic area in...

Author(s)
Norval, R. A. I.; Donachie, P. L.; Meltzer, M. I.; Deem, S. L.; Mahan, S. M.
Citation
Veterinary Parasitology, 1995, 58, 4, pp 335-352
Abstract

29 Mashona cows were allocated to 2 balanced groups and kept in separate paddocks at a stocking rate of 1 animal per 8 ha. One group received regular acaricide treatment to control bont (Amblyomma hebraeum) and other ticks with flumethrin pour-on preparation (Drastic Deadline) every 2 weeks. The...

Author(s)
Meltzer, M. I.; Norval, R. A. I.; Donachie, P. L.
Citation
Tropical Animal Health and Production, 1995, 27, 3, pp 129-144
Abstract

"Almost 100% of 52 cattle tested from the southern areas of Zimbabwe were found to have antibodies reactive with Rickettsia conorii compared with <30% of 120 cattle from the north. Steers artificially infected with R. conorii isolated from Amblyomma hebraeum were found to show no hematological or biochemical...

Author(s)
Kelly, P. J.; Mason, P. R.; Manning, T.; Slater, S.
Citation
Journal of Clinical Microbiology, 1991, 29, 2, pp 256-259
Abstract

This book was published to celebrate the 20th anniversary of the Tick Research Unit (founded 1971) of Rhodes University, Grahamstown, South Africa. The 14 chapters cover various aspects of the biology and control of ticks and the diseases they transmit, with a decidedly African (or southern...

Author(s)
Fivaz, B.; Petney, T.; Horak, I.
Publisher
Springer-Verlag, Berlin, Germany
Citation
Tick vector biology: medical and veterinary aspects., 1992, pp viii + 193 pp.
Abstract

The role of males of A. hebraeum (Malipati strain) in the transmission of C. ruminantium (Lemco and Nyatsanga isolates from Zimbabwe) was investigated. Transstadial (nymph to adult) and intrastadial transmission was demonstrated. Males transferred from live or dead hosts (sheep or goats) to live...

Author(s)
Andrew, H. R.; Norval, R. A. I.
Citation
Veterinary Parasitology, 1989, 34, 1-2, pp 15-23
Abstract

A spotted fever group (SFG) Rickettsia was isolated in Zimbabwe from a patient with tick-bite fever, headache and regional lymphadenopathy. A further 6 isolates were obtained from Amblyomma hebraeum ticks collected in Zimbabwe. These human and tick isolates were indistinguishable from each other,...

Author(s)
Kelly, P. J.; Beati, L.; Matthewman, L. A.; Mason, P. R.; Dasch, G. A.; Raoult, D.
Citation
Journal of Tropical Medicine and Hygiene, 1994, 97, 3, pp 129-137
Abstract

All of the adult cattle ticks Amblyomma hebraeum collected at Mbizi in the low veld of Zimbabwe, and then maintained for 1 year on sheep in Harare, were found to be infected by rickettsiae. One engorged female was used for transmission experiments with rabbits. Eggs from this female were allowed to ...

Author(s)
Kelly, P. J.; Mason, P. R.
Citation
Journal of Medical Entomology, 1991, 28, 5, pp 598-600
Abstract

Blood smears of 124 sable antelopes from South Africa and Zimbabwe were examined and 7 harboured Babesia irvinesmithi (Martinaglia 1936). 70 of the smears contained theilerial piroplasms, while 1 smear had macroschizonts (with cytomeres) and microschizonts of a Theileria (=Cytauxzoon) sp. One blood ...

Author(s)
Thomas, S. E.; Wilson, D. E.; Mason, T. E.
Citation
Onderstepoort Journal of Veterinary Research, 1982, 49, 3, pp 163-166
Abstract

Between April 1980 and July 1981 serum samples were collected from 30 cattle aged 1-3 years at each of 118 localities throughout Zimbabwe (63 communal farming areas and 55 commercial farms) and screened for antibodies to A. marginale by the capillary tube agglutination test. Tick samples were also...

Author(s)
Norval, R. A. I.; Fivaz, B. H.; Lawrence, J. A.; Brown, A. F.
Citation
Tropical Animal Health and Production, 1984, 16, 2, pp 63-70
Abstract

The disruption of veterinary services in the tribal areas of Rhodesia (now Zimbabwe) during seven years of conflict resulted in serious epidemics of disease. The cessation of dipping was followed by the death of an estimated one million cattle from tick-borne disease. Heavy mortality followed the...

Author(s)
Lawrence, J. A.; Foggin, C. M.; Norval, R. A. I.
Citation
Veterinary Record, 1980, 107, 4, pp 82-85

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