As other Campylobacter phages have been shown to depend on flagellar motility for infection, and this has been attributed to the use of flagella as a surface receptor for the phage [36], we first sought to determine whether the reason NCTC 12673 infectivity was impaired on pse mutants was due to a lack of adsorption to these aflagellate mutants. The gene discussed is SPDEF; the disease is infection.