لخّصلي

Because of the large number and diversity of genera included in the Enterobacteriaceae, it is helpful to consider the bacteria of this family as belonging to one of two major groups.For this reason, the discovery of these species in clinical specimens should alert laboratorians to possible identification errors; careful confirmation of both the laboratory results and the clinical significance of such isolates is warranted.General Characteristics Nucleic acid-based analysis has not proven effective for

Because of the large number and diversity of genera included in the Enterobacteriaceae, it is helpful to consider
the bacteria of this family as belonging to one of two
major groups. The first group comprises species that either commonly colonize the human gastrointestinal tract or are most
notably associated with human infections. Although many
Enterobacteriaceae that cause human infections are part of our
normal gastrointestinal microbiota, there are exceptions, such as
Yersinia pestis, Yersinia enterocolitica, and Yersinia pseudotuberculosis. The second group consists of genera that are capable of
colonizing humans but are rarely associated with human infection and are commonly recognized as environmental inhabitants or colonizers of other animals. For this reason, the discovery
of these species in clinical specimens should alert laboratorians
to possible identification errors; careful confirmation of both the
laboratory results and the clinical significance of such isolates is
warranted.
General Characteristics
Nucleic acid–based analysis has not proven effective for