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Anthelmintic Resistance
-history
1980 - First case (BZ) in sheep
reported
1980/81 survey of sheep farms found
resistance to BZs on 5 of 86 farms
and resistance to LEV on 6 of 86
farms
1983 - survey of milking goats found
BZ resistance on 76%,
levamisole/morantel on 49%.
Resistance to both on 38% farms
1987 - first case (BZ) in cattle
reported
1990-92 first cases of ivermectin
resistance in goats