TrichostrongylusTrichostrongylosisNematode InfectionsTrichostrongyloidiasisParasite Egg CountTrichostrongyloideaSheep DiseasesHaemonchusHelminthiasis, AnimalOstertagiaNematodaAntinematodal AgentsHaemonchiasisGoat DiseasesLaosStrongyloideaAncylostomiasisIvermectinAnthelminticsAncylostomaNecator americanusSheepHelminthsGoatsFecesLarva