Effect of praziquantel on adultEchinococcus granulosus in vitro: Scanning electron microscopy (original) (raw)
Abstract
The effect of praziquantel in vitro at concentrations of 5, 50 and 500 ppm for 1 h resulted in the progressive breakdown of the tegument and in morphologic distortion of adult_Echinococcus granulosus_ when compared to controls. Scanning electron microscopy of all specimens treated in the various concentrations of praziquantel showed loss of most, if not all, of the rostellar hooks and changes in the structure of the suckers. Many of the tapeworms immediately detached from the host's gut upon being placed in the drug, and all treated cestodes exhibited contraction or swelling, particularly in the penultimate proglottid. Intense contraction was apparent in the worms exposed to the higher drug concentrations. Characteristic conical microtriches on the terminal proglottid, as observed in the control specimens, became fused and matted when exposed to 5 ppm of praziquantel. At a drug concentration of 50 ppm, the tegumental surface developed grooves or furrows between clumps of fused microtriches, while 500 ppm caused production of holes within the denuded tegument of the parasite. Ovoid bodies, presumed to be eggs, were observed on the outer surfaces and just below the tegument of tapeworms treated with concentrations of 50 ppm. These structures also appeared to adhere to the outer surfaces of specimens exposed to 500 ppm. In view of the foregoing, special care should be taken in handling and disposing of feces from infected or suspect dogs after praziquantel treatment, since the breakdown in the tegumental surface of_E. granulosus_ presumably results in the release of potentially infective eggs.
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- George A. Conder
Present address: Upjohn Company, 9680-190-41, Kalamazoo, MI, 49001, USA
Authors and Affiliations
- Department of Microbiology and Public Health, Michigan State University, 48824, East Lansing, Michigan, USA
George A. Conder - Department of Zoology, Brigham Young University, 84602, Provo, Utah, USA
Alan A. Marchiondo & Ferron L. Andersen
Authors
- George A. Conder
- Alan A. Marchiondo
- Ferron L. Andersen
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Conder, G.A., Marchiondo, A.A. & Andersen, F.L. Effect of praziquantel on adult_Echinococcus granulosus_ in vitro: Scanning electron microscopy.Z. Parasitenkd. 66, 191–199 (1981). https://doi.org/10.1007/BF00925726
- Received: 23 January 1981
- Issue date: June 1981
- DOI: https://doi.org/10.1007/BF00925726