Gastrointestinal colonization.
D000328:Adult; D003428:Cross Infection / Q000382:microbiology*; D004064:Digestive System / Q000382:microbiology*; D004756:Enterobacteriaceae Infections / Q000382:microbiology*; D005243:Feces / Q000382:microbiology; D006801:Humans; D012706:Serratia marcescens / Q000302:isolation & purification