Table 4.

Summary of reported resistance to anticoccidials in field strains of Eimeria (adapted from Chapman 1997)

Drug	Year of introduction	Country where resistance was first described	Year resistance was first described	Speciesa
Sulphaquinoxaline	1948	USA	1954	Et
Nitrofurazone	1948	USA	1955	Not given
Nicarbazin	1955	Britain	1964	Et
Dinitolmide	1960	Britain	1964	Et, En
Amprolium	1960	Britain	1964	Eb
Clopidol	1966	Britain	1969	Ea, Em, Et
Buquinolate	1967	USA	1968	Not given
Methyl benzoquate	1967	Britain	1970	Et
Decoquinate	1967	Britain	1970	Et
Monensin	1971	USA	1974	Em
Robenidine	1972	USA	1974	Em
Halofuginone	1975	France	1986	Ea, Et
Lasalocid	1976	USA	1977	Ea
Arprinocid	1980	Britain	1982	Et
Salinomycin	1983	USA	1984	Various
Diclazuril	1990	Brazil	1994	Ea, Em, Et
Toltrazuril	1986	Netherlands	1993	Not given

^aSpecies: Ea, E. acervulina; Eb, E. brunetti; Em, E. maxima; En, E. necatrix; Et, E. tenella