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  • 1
    Electronic Resource
    Electronic Resource
    Differences in the Life Cycles Between a Vaccine Strain and an Unmodified Strain of Babesia bovis (Babes, 1889) in the Tick Boophilus microplus (Canestrini) (1978)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 25 (1978), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. 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, 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.In contrast, NT strain parasites were plentiful throughout the period of observation. They were predominantly spherical, ranging in diameter from 1.5 to 15 μm. Forms with obvious processes measuring up to 81 μm in length were seen in large numbers at seemingly regular intervals from 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. It is suggested that continuous blood passaging of the NT strain had resulted in selection of parasites incapable of penetrating gut epithelial cells of the tick.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1978.tb04175.x
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  • 2
    Electronic Resource
    Electronic Resource
    Immunosuppression by Babesia bovis against its tick vector, Boophilus microplus (1978)
    [s.l.] : Nature Publishing Group
    Nature 272 (1978), S. 818-819 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] B. microplus normally spends all its parasitic life (approximately 21 d) on one host. Partial acquired resistance can be produced by exposing the host to ticks and is manifested by a reduction in the number of ticks maturing10. In two experiments, we applied 0.25 g (5,000) tick larvae bi-weekly, to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/272818a0
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  • 3
    Electronic Resource
    Electronic Resource
    Reduction in pathogenicity ofBabesia bovis for its tick vector,Boophilus microplus, after rapid blood passage in splenectomized calves (1981)
    Springer
    Parasitology research 64 (1981), S. 347-351 
    Details
    ISSN: 1432-1955
    Keywords: Babesia bovis ; Babesia pathogenicity for tick vector ; Boophilus microplus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Two strains ofBabesia bovis that had been serially blood passaged in splenectomized calves 27 to 33 times, a procedure known to have reduced their virulence for normal cattle, were shown to have low pathogenicity for replete, femaleBoophilus microplus. In comparison with a strain ofB. bovis unmodified by repeated blood passage, the two modified strains infected higher proportions of ticks and produced comparable numbers of morphologically similar parasites in their haemolymph, but killed significantly fewer of them. Red discolouration of haemolymph was observed in many ticks infected with the unmodified strain, but in none of those infected with the modified strains. It is suggested that the modified strains have lost a quality causing pathological effects on the gut cells of infected ticks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927381
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  • 4
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    Immunosuppression by Babesia bovis against its tick vector, Boophilus microplus (1978)
    Springer Nature
    Details
    Publication Date: 1978-04-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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