Short communicationActivity of Decoquinate (cas 18507-89-6) against Cryptosporidium parvum in cell cultures and neonatal mice
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Add time:09/25/2019 Source:sciencedirect.com
Cryptosporidium parvum is an apicomplexan parasite that is an important cause of diarrhea in neonatal calves and humans. No treatment is currently available for neonatal calves. We have recently learned from colleagues in the pharmaceutical industry that dairy practitioners are sometimes using Decoquinate (cas 18507-89-6) for the treatment of neonatal bovine cryptosporidiosis. Therefore, the present study was undertaken to determine whether the clinical observations in calves can be substantiated by laboratory investigation. Oocysts of the KSU-1 isolate of C. parvum were used to infect human ileocecal epithelial cells in vitro to measure the efficacy of treatment using an ELISA based assay. No activity was observed at 10 or 50 μM decoquinate, but at 100 μM an 8% inhibition of development was seen. Oocysts of the AUCp-1 isolate of C. parvum were then used to infect suckling mice. The numbers of oocysts observed in suckling mice treated with 2.5 or 5.0 mg/kg decoquinate were not significantly different from untreated control suckling mice (p>0.05). The results of our study suggest that decoquinate should have little efficacy for treatment of neonatal bovine cryptosporidiosis if administered once per day and that any clinical improvement observed in treated calves may be due to factors unrelated to decoquinate’s effect on C. parvum.
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