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[Relationships of the plague pathogen and vector from different parasitic systems]

L P Bazanova, G A Voronova, S A Kosilko

    Meditsinskaia Parazitologiia I Parazitarnye Bolezni
    |June 29, 2013
    PubMed

    Insights

    Plague microbe strains from Mongolia and China interact differently with flea vectors. Strain I-3230 forms longer-lasting infections in Citellophilus tesquorum sungaris fleas, while strain 2155 more readily blocks Xenopsylla cheopis fleas.

    Area of Science:

    • Microbiology and Infectious Diseases
    • Vector-borne disease transmission
    • Epidemiology of plague

    Background:

    • Plague is a zoonotic disease caused by the bacterium Yersinia pestis.
    • Natural foci of plague exist in Mongolia and China, with specific subspecies of the plague microbe circulating.
    • Fleas, such as Citellophilus tesquorum sungaris and Xenopsylla cheopis, are primary vectors for Yersinia pestis transmission.

    Purpose of the Study:

    • To investigate the interaction features between specific Yersinia pestis strains from Mongolian and Chinese foci and their flea vectors.
    • To compare the transmission capabilities and survival patterns of different Yersinia pestis strains within distinct flea species.

    Main Methods:

    • Experiments utilized virulent Yersinia pestis strains: I-3230 (from C. tesquorum in Mongolia) and 2155 (from humans in China).
    • Infection and transmission dynamics were studied in Citellophilus tesquorum sungaris and Xenopsylla cheopis fleas.
    • Formation of bacterial conglomerates and proventricular blocks within fleas were key observation parameters.

    Main Results:

    • Both C. tesquorum sungaris and X. cheopis fleas demonstrated the ability to transmit the studied Yersinia pestis strains.
    • Yersinia pestis strain I-3230 exhibited a greater capacity for forming bacterial conglomerates compared to strain 2155.
    • Strain 2155 more effectively formed proventricular blocks in X. cheopis, resulting in a 3-7 times shorter blocking period than in C. tesquorum sungaris.

    Conclusions:

    • The adaptive features of Yersinia pestis strain I-3230 may facilitate prolonged survival within C. tesquorum sungaris, particularly during colder periods.
    • Differential interactions between Yersinia pestis strains and flea vectors influence transmission efficiency and disease dynamics in natural plague foci.
    • Understanding these vector-pathogen interactions is crucial for predicting and controlling plague outbreaks in endemic regions.

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