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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 | — | — |
