“…Concern has long been expressed over their use as carbadox is genotoxic and carcinogenic in experimental animals, while olaquindox is genotoxic although it has not been shown to be carcinogenic (Sykora & Vortel, 1986;Woodward, 2004). Olaquindox has been reported to cause allergic and photoallergic dermatitis in farm workers, largely in those involved with pigs, following occupational exposure (Bedello et al, 1985;Francalanci et al, 1986;Schauder, 1989;de Vries et al, 1990a,b;Hochsattel et al, 1991;Fewings & Horton, 1995;Kumar & Freeman, 1996;Schauder et al, 1996;Sanchez-Pedreno et al, 2001;Belhadjali et al, 2002;Sanchez-Perez et al, 2002). Their phototoxic potentials have also been demonstrated in animal models (de Vries et al, 1990a,b;Eberlein et al, 1992).…”