“…Failure of macrocyclic lactone (ML) treatment to reduce the shedding of P. equorum eggs has been reported in several countries, such as the Netherlands (Boersema et al, 2002), Canada (Hearn and Peregrine, 2003), the United Kingdom (Stoneham and Coles, 2006), the United States (Craig et al, 2007), Denmark (Schougaard and Nielsen, 2007), Germany (von Samson-Himmelstjerna et al, 2007), Brazil (Molento et al, 2008), Sweden (Lindgren et al, 2008), Italy (Veronesi et al, 2009) and Finland (Näreaho et al, 2011). In ML-resistant populations of P. equorum, treatment with pyrantel pamoate, fenbendazole and oxibendazole has been successful (Slocombe et al, 2007;Lyons et al, 2008;Schougaard and Nielsen, 2007;Hearn and Peregrine, 2003).…”