Eighteen strains of Gram‐negative, rodshaped bacteria, includingMoraxella kingii, “NewMoraxella” Bijsterveld, “NewMoraxella” Sutton et al., M. nonliquefaciens, M. lacunata, M. bovis, M. osloensis, M. phenylpyrouvica, M. atlantae(new species to be described),M. urethralis(tentative designation) andAcinetobacter, were examined for enzyme activities corresponding to thymidine phosphorylase, nucleoside deoxyribosyltransferase and thymidine kinase. The two strains ofM. kingiiexamined as well as “NewMoraxella” Bijsterveldand “NewMoraxella” Sutton et al., revealed activities corresponding to the three enzymes. One of twoM. nonliquefaciensstrains, the type strain, was found to contain a thymidine kinase of low activity, but had no activities corresponding to the enzymes thymidine phosphorylase or nucleoside deoxyribosyltransferase. Significant activities of any of the three enzymes were not detected in the other