Objective To explore the biological characteristics of Serratia marcescens phages isolated from sewage for a further investigation to develop phage agents against drug-resistant Serratia marcescens.Methods Lytic phages of Serratia marcescens were isolated and identified by using a double-agar method,the specificity of phages to host cells was observed.Phage samples for observation by electron microscopy were carried out with negative-stain.The extracted genomes of lytic phages were analyzed with restriction...