alexa Factors affecting the efficacy of ivermectin against Heligmosomoides polygyrus (Nematospiroides dubius) in mice.
Agri and Aquaculture

Agri and Aquaculture


Author(s): Wahid FN, Behnke JM, Conway DJ

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Abstract The efficacy of ivermectin against Heligmosomoides polygyrus was investigated in 5 mouse strains (CFLP, NIH, C57Bl10, BALB/c and CBA) using a variety of dose levels, and subcutaneous and oral administration. Heligmosomoides polygyrus were not completely eliminated when 5 mg kg-1 of ivermectin was given 6 days after infection, but 10 mg kg-1 was totally effective. Significant mouse-strain variation in drug efficacy was detected, NIH mice requiring treatment with higher doses than CFLP mice in order to bring about a comparable level of larvicidal activity. Ivermectin was more effective when given subcutaneously than when given orally, regardless of the dose administered or the strain of mouse tested. The anthelmintic effect of the treatment was more persistent in CFLP mice given 20 mg kg-1 subcutaneously than in NIH mice or in mice treated orally, and a 20-day interval between administration and infection was insufficient to prevent inhibition of parasite survival. Ivermectin was shown to be totally effective at 20 mg kg-1 given subcutaneously in killing immune arrested larvae of H. polygyrus.
This article was published in Vet Parasitol and referenced in Agrotechnology

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