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Bacillus thuringiensis  is a gram-positive soil-dwelling bacterium that is commonly used as a biological pesticide. This bacterium may also be used for biological control of helminth parasites in domestic animals. In this study, we evaluated the possible ovicidal and cestocidal effects of a total protein extract of  B. thuringiensis  native strains on the zoonotic cestode parasite of dogs,  Dipylidium caninum  ( D. caninum ). Dose and time response curves were determined by coincubating  B. thuringiensis  proteins at concentration ranging from 100 to 1000   μ  g/mL along with 4000 egg capsules of  D. caninum . Egg viability was evaluated using the trypan blue exclusion test. The lethal concentration of toxins on eggs was 600   μ  g/ml, and the best incubation time to produce this effect was 3 h. In the adult stage, the motility and the thickness of the tegument were used as indicators of damage. The motility was inhibited by 100% after 8 hours of culture compared to the control group, while the thickness of the cestode was reduced by 34%. Conclusively, proteins of the strain GP526 of  B. thuringiensis  directly act upon  D. caninum  showing ovicidal and cestocidal effects. Thus,  B. thuringiensis  is proposed as a potential biological control agent against this zoonosis.

In VitroOvicidal and Cestocidal Effects of Toxins fromBacillus thuringiensison the Canine and Human ParasiteDipylidium caninum