Research Article
First Report of Anthelmintic Resistance in Gastrointestinal Nematodes of Sheep from Costa Rica
Table 4
Anthelmintic resistance to ivermectin in gastrointestinal nematodes of sheep flocks in Costa Rica.
| | Nematode | Ivermectin (%) | | Susceptible | Suspicious | Resistant |
| | Haemonchus spp. | 43 | 29 | 29 | | Trichostrongylus spp. | — | 71 | 29 | | Cooperia spp. | 43 | 57 | — | | Strongyloides sp. | 14 | 43 | 43 | | Oesophagostomum spp. | 100 | — | — | | Chabertia sp. | 100 | — | — |
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