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Hamel D, Kunkle BN, Liebstein M, Bader J, Shryock J, Visser M, Yoon S, Fankhauser B, Rehbein S. Eprinomectin 5% w/v extended-release injection for the treatment of larval and/or adult Bunostomum phlebotomum, Haemonchus contortus, H. placei, Nematodirus helvetianus, Oesophagostomum radiatum, and Trichostrongylus colubriformis infections in cattle. Parasitol Res 2022; 121:2173-2178. [PMID: 35503138 DOI: 10.1007/s00436-022-07529-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 04/24/2022] [Indexed: 11/24/2022]
Abstract
In an effort to generate data for regulatory purposes on the therapeutic efficacy of eprinomectin 5% w/v extended-release injection (Eprinomectin ERI) (LongRange®, Boehringer Ingelheim) against infections of immature and adult stages of some nematode species (or stages) which are generally less common or predominantly seen in younger cattle, nine studies (minimum two per parasite and stage) were conducted in the USA and Germany. A total of 218 young cattle were included in seven experimentally induced infection studies (180 animals) and two studies with naturally acquired nematode infections (38 animals), which were compliant with WAAVP and VICH guidelines. In each study, cattle were randomly assigned into groups which received 1 mL per 50 kg body weight of either saline (controls) or Eprinomectin ERI (equivalent to 1 mg eprinomectin per kg body weight) via subcutaneous injection when the parasites were developing fourth-stage larval (L4) or adult nematodes. Following necropsy and parasite recovery, percentage efficacy was calculated based on the comparison of geometric mean nematode counts of the Eprinomectin ERI- vs. the saline-treated animals. Eprinomectin ERI-treated cattle had significantly (p < 0.05) lower counts of each species and stage of nematodes than the controls. Eprinomectin ERI treatment was demonstrated to be efficacious (> 90%) against L4 and adult Bunostomum phlebotomum and Nematodirus helvetianus; against L4 Haemonchus placei, Oesophagostomum radiatum, and Trichostrongylus colubriformis; and against adult H. contortus. Percentage efficacy against L4 H. contortus was variable (69.6 to 100%). All treatments were well accepted, and no treatment-related health problems were observed in any study.
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Affiliation(s)
- Dietmar Hamel
- Boehringer Ingelheim Vetmedica GmbH, Kathrinenhof Research Center, Walchenseestr. 8-12, 83101, Rohrdorf, Germany.
| | - Bruce N Kunkle
- Boehringer Ingelheim Animal Health USA Inc., Missouri Research Center, 6498 Jade Road, Fulton, MO, 65251, USA
| | - Martin Liebstein
- Boehringer Ingelheim Animal Health USA Inc., Missouri Research Center, 6498 Jade Road, Fulton, MO, 65251, USA
| | - Jonathan Bader
- Boehringer Ingelheim Animal Health USA Inc., Missouri Research Center, 6498 Jade Road, Fulton, MO, 65251, USA
| | - Jeffrey Shryock
- Boehringer Ingelheim Animal Health USA Inc., Missouri Research Center, 6498 Jade Road, Fulton, MO, 65251, USA
| | - Martin Visser
- Boehringer Ingelheim Vetmedica GmbH, Kathrinenhof Research Center, Walchenseestr. 8-12, 83101, Rohrdorf, Germany
| | - Stephen Yoon
- Boehringer Ingelheim Animal Health USA Inc., 3239 Satellite Boulevard, Duluth, GA, 30096-4640, USA
| | - Becky Fankhauser
- Boehringer Ingelheim Animal Health USA Inc., 3239 Satellite Boulevard, Duluth, GA, 30096-4640, USA
| | - Steffen Rehbein
- Boehringer Ingelheim Vetmedica GmbH, Kathrinenhof Research Center, Walchenseestr. 8-12, 83101, Rohrdorf, Germany
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