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Enterobacteriaceae Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.


- Largest collection of gram neg bacteria
- Tests: bioche­mical proper­ties, (e.g. sugars fermented, enzymes used), molecular methods.
- GI infect­ions, UTIs (70%), septic­aemias (30-35%)
- Some are opport­unistic
- Motile (perit­richous all over) and non motile
- Asporo­genic
- Rapid growth, non selective media
- Aerobic & anaerobic


LPS (lipop­oly­sac­cha­ride) :
- O polysa­cch­aride (somatic antigen)
- Core polysa­cch­aride
- Lipid A (toxic to host cell, overst­imu­lation of immune system)

- Typed by antige­n-> O/K on capsule, H on flagella.
- Ferment glucose, reduce nitrate
- Catalase + (can break down hydrogen peroxide)
- Cytochrome Oxidase needed as final electron acceptor