“…Many papers have been published on the duration of IBV infections in the chicken (Hofstad & Yoder, 1966;Doherty, 1967;Colwell & Lukert, 1969;Cook, 1971;Crinion et al, 1971;Jones & Jordan, 1972;Hawkes et al, 1983;Smith et al, 1985;ElHouadfi et al, 1986;Jones & Ambali, 1987;Bumstead et al, 1989;Ambali & Jones, 1990;Otsuki et al, 1990;Nakamura et al, 1991;Owen et al, 1991;Bhattacharjee et al, 1995;Dhinakar Raj & Jones, 1997a;De Wit et al, 1998b). These studies involve a large variety of sampled organs, different virus strains, different doses, etc., and can therefore be expected to present partly conflicting data about the intervals in which the virus can be detected in the various organs.…”