S.marcescens is opportunistic pathogens that cause nosocomical infections. There have been many reports concerning the identification, antibiotic susceptibility, pathogenicity, epidemiological investigations and typing of this organism. Accurate identification is important in defining outbreaks. In the present study,
S. marcescens have been selected from the natural sources and were then confirmed with 16S rRNA identification method with cultures of MTCC. To investigate these
S. marcescens isolates, random amplification of polymorphic DNA (RAPD) was used in conjunction with the specific primers. The RAPD patterns for each isolate were identified on the basis of identical numbers and sizes of the bands. And by using dendrogram we can able to show, that the pattern of the primers to separate isolates was closely related to their sequence homology with the genome and their amount of guanine and cytosine nucleotide content.
S. marcescens as a pathogen shows a tissue-damaging capacity. The cytotoxic activity is mainly elicited by the secreted hemolysin/cytotoxin ShlA. Here, the isolates were tested for hemolytic activity.
S. marcescens is known to be frequently resistant to various antibiotics and our results also showed such a tendency.