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Differences in the life cycles between a vaccine strain and an unmodified strain of babesia bovis in the tick boophilus microplus


, : Differences in the life cycles between a vaccine strain and an unmodified strain of babesia bovis in the tick boophilus microplus. Journal of Protozoology 25(4): 497-501

Developmental forms of 2 strains of Babesia bovis were studied in the tick vector Boophilus microplus. One strain (T) was infective for the tick, and the other (NT) lost infectivity for the tick because of repeated blood passaging in cattle. Parasites of the 2 strains in gut contents of adult female ticks were similar during the first 16 h post-repletion (PR), but thereafter their structure differed. From 16-64 h PR, the majority of T strain parasites were spherical and without processes. During the next 32 h elongate forms and vermicules developed. Fission bodies were seen within epithelial cells of the gut by 96 h PR. T-strain parasites in gut contents decreased in number from 96 h and were difficult to find at 144 h, the time of the final observation. NT strain parasites were plentiful throughout the period of observation. They were predominantly spherical, with a diameter of 1.5-15 .mu.m. Forms with obvious processes measuring up to 81 .mu.m in length were seen in large numbers at seemingly regular intervals of 16-144 h PR, suggesting that a process of development and divisions was being repeated. No vermicules or fission bodies were seen. T-strain, but not NT strain parasites, were seen in hemolymph and ova of the ticks and in their larval progeny. Continuous blood passaging of the NT strain apparently resulted in selection of parasites incapable of penetrating gut epithelial cells of the tick.


Accession: 005151359

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Related references

Stewart, NP., 1978: Differences in the life cycles between a vaccine strain and an unmodified strain of Babesia bovis (Bakes, 1889) in the tick Boophilus microplus (Canestrini). Developmental forms of 2 strains of Babesia bovis were studied in the tick vector Boophilus microplus. One strain (T) was infective for the tick, and the other (NT) lost infectivity for the tick because of repeated blood passaging in cattle. Paras...

Stewart, N.P., 1978: Differences in the life cycles between a vaccine strain and an unmodified strain of Babesia bovis (Babes, 1889) in the tick Boophilus microplus (Canestrini). Developmental forms of 2 strains of Babesia bovis (Babes) were studied in the tick vector Boophilus microplus (Canestrini). One strain (designated T) was shown to be infective for the tick, and the other (NT) to have lost infectivity for the tick,...

Bettin dos Santos, T.R.gina.; Gonzales, J.C.rlos.; Chies, J.M.ria. da Rosa Farias, N.A.elia., 2000: Babesia bovis transovarian transmission in Boophilus microplus obtention of a Babesia free tick strain Transmissao transovariana de Babesia bovis em Boophilus microplus obtencao de cepa de carrapato livre de Babesia spp. Ciencia Rural. mai-jun; 303: 455-459

Dalgliesh, R.J.; Stewart, N.P.; Mellors, L.T., 1979: Some effects of temperature on the life-cycles of Babesia bovis and Babesia bigemina in the tick Boophilus microplus. The results of several previously reported experiments support the hypothesis that the intial development of Babesia bigemina in ticks is dependent on ingested parasites being exposed to a fall in temperature.

Dalgliesh, R.J.; Stewart, N.P.; Mellors, L.T., 1980: Some effects of temperature on the life-cycles of Babesia bovis and Babesia bigemina in the tick, Boophilus microplus. The relevant literature is reviewed and evidence from recent work presented to show that changes in temperature initiate 2 critical changes enabling the cyclical transmission of Babesia bovis and B. bigemina to proceed. One of these changes occurs...

Santos, T.R.B. dos; Gonzales, J.C.; Chies, J.M.; Rosa Farias, N.A. da, 2000: Transovarian transmission of Babesia bovis in Boophilus microplus: obtaining a Babesia-free tick strain. Semi-engorged B. microplus females were fed on carrier and B. bovis-infected cattle. On the 18th day after infestation, semi-engorged females were collected directly from the animals and after the 21st day, engorged females dropped off to the grou...

Mafra, C.L.; Patarroyo, J.H.; Silva, S.S., 1994: Babesia bovis: infectivity of an attenuated strain of Brazilian origin for the tick vector, Boophilus microplus. In order to verify the infectivity and transovarian transmission of one strain of Babesia bovis of Brazilian origin, attenuated by repeated passages in splenectomized calves to the biological tick vector, Boophilus microplus, an inoculation of tha...

Mafra, CL.; Patarroyo, JH.; Silva, SS., 1994: Babesia bovis: infectivity of an attenuated strain of Brazilian origin for the tick vector, Boophilus microplus. In order to verify the infectivity and transovarian transmission of one strain of Babesia bovis of Brazilian origin, attenuated by repeated passages in splenectomized calves to the biological tick vector, Boophilus microplus, an inoculation of tha...

Mason, T.E.; Potgieter, F.T.; van Rensburg, L., 1986: The inability of a South African Babesia bovis vaccine strain to infect Boophilus microplus. A strain of Babesia bovis that had been attenuated by rapid syringe passage through a series of 23 splenectomized calves was unable to infect its vector Boophilus microplus. An attempt to transmit the attenuated Australian Babesia bigemina G strai...

Mangold, A.J.; Aguirre, D.H.; Cafrune, M.M.; de Echaide, S.T.; Guglielmone, A.A., 1993: Evaluation of the infectivity of a vaccinal and a pathogenic Babesia bovis strain from Argentina to Boophilus microplus. Three trials were performed to test the infectivity of a vaccinal and a pathogenic strain of Babesia bovis for the tick Boophilus microplus. The progeny of engorged female ticks fed on calves inoculated with the pathogenic strain were able to tran...