Figure 4.
Changes in the proportions of genotypes following in vivo passage of a hypermotile variant of C. jejuni strain NCTC11168. Two-week-old out-bred chickens were inoculated with 1 × 108 cfu. Caecal samples were collected 2 weeks after inoculation and C. jejuni was enumerated by growth of dilutions on selective plates. The genotypes for phase variable genes were derived by the same approach as in Figure 3 for the same six genes. Genotypes were derived for 30 colonies from the inoculum and for 23–29 colonies from output populations following growth under identical conditions. Inoc, inoculum; B6–B11, individual birds.