First Report of Anthelmintic Resistance in Gastrointestinal Nematodes of Sheep from Costa Rica

Table 1

Gastrointestinal nematode egg count percent reduction after treatment with albendazole in seven flocks from Costa Rica.

Farm	Control		Albendazole		Percentage of reduction	CI 95%		Drench effectiveness
	n	𝑋 epg	n	𝑋 epg		Lower	Upper
A	15	1977	15	713	64	−5	88	Resistant
B	10	570	13	23	96	86	99	Suspicious
C	11	250*	13	308	−23	−336	65	Resistant
D	13	608	13	562	8	−98	57	Resistant
E	13	100*	14	164	−64	−545	58	Resistant
F	14	2593	12	296	89	64	96	Resistant
G	15	1700	15	230	86	64	95	Resistant

*These flocks were 300 or more epg in the pre-treatment phase.