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Related Experiment Videos

In vitro cultivation of Anaplasma marginale: growth pattern and morphologic appearance.

R H Kessler, M Ristic, D M Sells

    American Journal of Veterinary Research
    |December 1, 1979
    PubMed
    Summary

    Anaplasma marginale replication in vitro increased significantly across three experiments. Cultures demonstrated sustained viability, confirming successful in vitro propagation of this important cattle pathogen.

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    Area of Science:

    • Veterinary Microbiology
    • Parasitology
    • Cell Biology

    Background:

    • Anaplasma marginale is a tick-borne pathogen causing significant economic losses in cattle.
    • Efficient in vitro propagation methods are crucial for studying Anaplasma marginale.
    • Understanding Anaplasma marginale replication dynamics is key to developing control strategies.

    Purpose of the Study:

    • To evaluate the replication rate of Anaplasma marginale propagated in vitro.
    • To assess the viability of cultured Anaplasma marginale.
    • To characterize the ultrastructure of Anaplasma marginale in culture.

    Main Methods:

    • Anaplasma marginale was propagated in vitro using bovine erythrocytes.
    • Replication was monitored by Giemsa staining and direct fluorescent antibody techniques.

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  • Organism ultrastructure was examined using electron microscopy.
  • Culture viability was confirmed by inoculation of susceptible calves.

    • Main Results:

    • In vitro Anaplasma marginale replication rates increased over successive experiments.
    • Parasitemia increased more than threefold in 8 days and tenfold in 14 days in initial experiments.
    • A third experiment showed a more rapid growth trend after 8 days.
    • Inoculation of calves confirmed the viability of 13- and 33-day-old cultures.

    Conclusions:

    • Anaplasma marginale can be effectively propagated in vitro with increasing replication rates.
    • In vitro cultures maintain organism viability, supporting their use in research.
    • This study provides a foundation for further investigation into Anaplasma marginale biology and control.