Fig. 3

Seroconversion to avian HEV in the experimental chickens from the cage-free and caged arrangements. a: Cage-free (Inoculated) groups;(b): Caged (Inoculated) groups. The dotted line represents the cut-off values of the indirect ELISA used for detection of the avian HEV antibodies in the serum samples. NC1: Cage-free (Negative) group;NC2: Caged (Negative) group. The week post-inoculation on 0 the X axis represents the period prior to inoculation