摘要：The chemotactic behaviour of Campylobacter strains was determined in presence of different amino acidsat two different temperatures of 37°C and 42°C. Two strains of Campylobacter, catalase positive(Campylobacter jejuni) and catalase negative (Campylobacter sputorum) were isolated from river water inTonekabon, Iran and identified by phenotyping and 16srRNA gene sequencing methods. Chemotacticresponses of the isolates were assessed towards a variety of amino acids viz., L-cystine, L-asparagine,L-histidine, L-aspartic acid, L-serine, L-phenylalanine, L-leucine and L-tryptophan by disc and capillary methodsat two temperatures 37°C and 42°C. Campylobacter jejuni showed positive chemotactic response towardsL-cystine, L-tryptophan, L-phenylalanine, L-leucine, L-asparagine and L-serine at both, 37°C and 42°C,however, it was greater at 37°C. Campylobacter sputorum showed negative or weak response towards allthe amino acids. In addition, Campylobacter jejuni illustrated strong chemotactic response to L-asparaginefollowed by L-serine, and weak chemotaxis response to L-phenylalanine and L-cysteine at 37°C. Overall,Campylobacter jejuni showed relatively strong chemotactic response to some amino acids and its stimulationwas greater at 37°C. Hence, the human body temperature (37°C) in comparison to avian body temperature(42°C) probably promotes chemotactic response of Campylobacter jejuni, which might be a reason forcausing diseases in human beings compared to avian species.
