| isolation and characterization of catalase-negative and catalase-weak strains of campylobacter species, including "campylobacter upsaliensis," from humans with gastroenteritis. | during 1987 and 1988, nine strains of catalase-negative or -weak campylobacter species were isolated in alberta, canada. dna hybridization studies demonstrated that seven strains were "campylobacter upsaliensis," one strain was highly homologous with campylobacter jejuni dna, and one strain was a campylobacter unrelated to the other two species. all "c. upsaliensis" strains were hippurate negative, and six of seven were susceptible to cephalothin. the unusual variant of c. jejuni was hippurate p ... | 1989 | 2778067 |