They lack cytochrome oxidase and is called negative.

General

This group includes several organisms that cause

primary infection of the gastrointestinal tract of man. Thus, they call

like (regardless of cause intestinal disorders). Bacteria that affect

gastrointestinal tract include certain strains of E. coli

and salmonella, all 4

Shigella species and

Yersinia entercolitica. >> << Rheumatic disease, Reiter's syndrome (associated with HLA-B27), can result from

in contact with salmonella

,

Shigella, or

Yersinia. More >> << organisms that are not members

Enterobacteriacae, including

Campylobacter and Chlamydia,

<< agents as Reiter's syndrome. >> Yersina plague (cause fever) is

considered separately from other organisms. Members of this family are the main causes

opportunistic infections (including sepsis, pneumonia, meningitis and urinary tract infection

). Examples of genera that cause opportunistic infections are:

Citrobacter, Enterobacter

coli,

,

Hafnia,

Morganella,

Providencia and Serratia. The choice of antibiotic therapy

complicated by the diversity of organisms. Some organisms also lead to outpatient

disease in healthy people. Klebsiella pneumonia often

involved in respiratory infections. The body has a prominent capsule help

pathogenicity. The most common outpatient (ascending) urinary tract infection caused by

E.coli. The vast majority of urinary tract infections

growing, often from fecal contamination. Proteus is

another common cause of urinary tract infection, the body produces, which reduces the production of urea alkaline urine. Isolation and identification of gram-negative enterobacteria It optionally anaerobic rods. They lack cytochrome cheap strattera oxidase and is called negative. They

frequently isolated from feces in agar containing lactose and pH indicator. Colonies that ferment lactose to produce enough acid to cause >> << color change indicator (Fig. 1). E. coli

is the fermentation of lactose, while

Shigella, Salmonella and Yersinia

is fermenters. Non-pathogenic strains of E. coli

(and other lactose positive

enterics) are often present in normal feces. Because they are difficult to distinguish from

pathogenic E. coli, lactose

negative colonies often only found in the stool. All

Enterobacteriaceae isolated from other sites (which contain small amounts of bacteria [eg, urine] or

usually sterile [eg, blood]) are defined biochemically, such as

, using API 20E

system. Important serotypes can be differentiated by their O (LPS),

H (flagellates) and K (capsular) antigens. But

usually

, not done in routine clinical laboratory. .