Hemostasis Physiology and Clinical correlations by Dr Faiza.pdf
Proteus Microbiology Course Summary
1. Sharq Elneil College
School of Medical Laboratory
Sciences
Department of Microbiology
Medical Bacteriology course
Proteeae
U.Mahadi Hassan Mahmoud
Bsc, Msc, MIBMS Microbiology
5. General characters:
Member of enterobacteriaceae.
Saprophytes (life in water & soil).
Some are commensal in human
intestine.
Non-sporing.
Non-capsulated.
The main 2 species:
• P. mirabilis.
• P. vulgaris.
7. Culture characters
Non-fastidious.
MacConkey agar: pale yellow colonies
(NLF), moderate in size, moist and low
convex.
CLED: pale blue-green colonies (NLF).
Blood agar & nutrient agar: grow and
produced swarming cover all the plate
(characteristic).
Produced fishy smell.
8.
9. Swarming in Proteus mirabilis. (B) Movement of a mass of cells
at the swarming periphery. (C) Characteristic colony morphology.
The pattern is produced by alternating cycles of differentiation,
movement, and consolidation.
10.
11.
12. How to prevent swarming
Increase the agar concentration (from 1.2-
1.5% to 6%).
CLED (electrolytes deficiency).
To add chemicals: chloral hydrate, Na-
azide & paranitroglycerol.
MacConkey agar (Bile salt).
13. Viability
Easy to killed by heat.
Easy to killed by lab-
disinfectant.
Sensitive to most antimicrobial
agent used for
enterobacteriaceae.
16. PPA TEST :
Left-hand tube exhibits a positive reaction(green).
Other tube is negative.
17. Antigenic structure
Possess O- antigen (classification
& identification).
Possess H-antigen.
Do not possess K-antigen.
18. Pathogenicity
Cause opportunistic infection.
UTI following catheter & surgery.
Wound infection.
Otitis media.
Septicemia (complication of UTI &
wound infection).
Pneumonia (very rare).
19. Dienes phenomenon
Test used for identification of Proteus
& differentiation of species.
If inoculate two strains of Proteus as
spot on non-inhibitory culture media
in different polar and after incubation;
if the strains are different, the
swarming will be separated by line
and if they are identical there is no
line of separation.
This test help in epidemiology.
20.
21. Weil-flex reaction
There are cross reaction between
certain species of Proteus and
Rickettsia (which cause typhus fever &
it is grow only on Tissue culture).
When treated pt serum of person
infected with typhus fever with Proteus
Ag from spp (OX19, OXK and OX2)
will give +ve reaction.
22. LAB- Diagnosis
Specimen: according to the side of
infection ( Pus, swabs, blood, urine,
sputum……etc).
Direct Gram stain (same specimen).
Culture & incubation.
Colonial morphology.
Indirect Gram stain.
Biochemical reaction.
23. Antimicrobial susceptibility
Antibiotics with activity against P. mirabilis
include
ampicillin cephalosporins and
aminoglycosides.
Some strains of P. mirabilis are beta
lactamase producing and therefore
resistant to ampicillin.
Proteus species are resistant to polymyxin
and nitrofurantoin