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اليوم 11/11
انتظرو من تصير ب11:11 م
احس هذا اليوم بؤرة الطاقة الايجابية 😍😍 ترفع فيها رسائل الى السماء 💛
حضرو امنياتكم 💛
Bacillus : Anthrax
-G(+)
-spore (oval, central, nonbulging )
-capsulated
-catalase (+)
-non motile
-Blood agar (non haemolysis , Medusa head appearance)
-spore stained by (malachite green and safranin)
LISTERIA :
-G(+)
-motile at 25 C° . nonmotile at 37C°
-Mc agar : no growth
-Blood agar :
•L.monocytogens : narrow zone B-haemolysis
•ivanovii : wider zone B-haemolysis
CAMP :
•L.monocytogenes (+) with S. aureus (SA)
•L. ivanovii (+) with R. equi (RE).
Anton test
- Pathogenicity test in rabbit to confirm virulence
- Virulent strains induce keratoconjuctivitis
serology : not usefull (positive titer in normal animals and cross reaction with another G+ bacteria. Like S.aureus… )
Klebsiella :
-G(-)
-nonmotile
-colony morphology :
(On blood agar and Mc agar is mucoid colony (vascosity test) .
-IMViC (- - + + ) ☻ عكس ايكولاي
-citrate (+)
- Urease : (+)
-TSI :A/A
proteus :
-G(-)
-motile
-indole
• P.mirabilis (-)
• P.vugaris (+)
-swarming on agar.
-urease (+)
- TSI : k/k + H2S production
Clostridim
C.Tetani :
-G(+)
-motile
-spore : drum stick shape 🥁 (oval,termnal, bulging)
-Blood agar : beta-haemolysis
-cooked meat agar swarming
-strict anaerob
C. botulinum :
-fastidiius
-strict anaerob
-spore : oval subtermnal bulging
-Blood agar : beta-haemolysis
-motile
C.perfringens :
-non motile
-capsulated
-Spore (oval, subtermnal , non bulging )
- Blood agar ( double zone haemolysis )
- litmus milk (stormy reaction) {Ferment lactose (acid production), color changed from blue to pink.Coagulation of milk casein by acid, and clotted milk is disrupted by gas production}
- Nagler’s reaction (growth of C.perfringens in serum or egg yolk agar producing turbidity around the colonies due to production of a-toxin (phospholipase C) )
Salmonella and Shigella
Gram stain :
-G(-)
-Short rod
-non capsule
-not motile
-no spores
• Mc agar : NLF
•IMViC (+ + - -)
Selective media :
1•SS agar :
--salmonella ⇨pale with black center .
-- shigella ⇨ pink .
2•XLD :☻ مبينه
3•Chrome agar : salmonella (purple)
TSI :
- salmonella : K/A + H2S Production
-shigella : K/A
E.coli :
Mc agar :
Selective to G(-) entirobecteriacea
Differential to lactose fermenter (pink) and non lactose fermenter (colorless)
E.coli colony is ( dry, pink 'lactose fermenter' ) on Mc agar .
On EMB : green metallic sheen .
Biochemical tests :
- ferment (glucose , lactose , fructose)
- IMViC (+ + - -)
- indole (+)
- methyle red test (+)
- simmons citrate (-)
- vogas-proskauer test (-)
- motile
TSI : A/A + Gas production
MYCOBACTERIUM
Grow on Löwenstein–Jensen medium
grow :
- Slow-growing (2–6 weeks ) at 37°C.
- colony morphology
‘ rough, tough and buff ’ colonies (__rough__ due to dry,
tough due to difficulty in lifting the colony from the surface ; and buff due
to the pale yellow color)
ACID FAST STAINS
• Ziehl-Neelsen – uses heat to drive the color into the
lipids of the cell wall; decolorized with acid-alcohol
• Kinyoun – cold stain .
ZIEHL-NEELSEN ACID-FAST
STAINING PROCEDURE :
1.fixation by heat .
2.add carbol fuchsin stain.
3.Heat the slide until it steams (5 min).
4.Pour off the carbol fuchsin.
5.Wash slide with water.
6.Decolorize with acid-alcohol (5 min).
7.Wash slide with water.
8.add methylene blue counterstain for 1 min.
9.Wash with water.
10. dry with bunsen flame.
Positive Result is:
The acid-fast bacilli are red color rods.
Corynebacterium
• growth on Loeffler's medium .
Stained by Albert’s stain : appear as metachromatic appearance ( Cytoplasm light green, granules blue-black)
Mechanism of Tellurite Blood Agar
• Reduction By Bacteria
• Tellurium Precipitation
• Black Colonies
Streptococcus
Mc agar : no growth
catalase : (-)
Blood agar :
alpha :
-viridins
-Pneumonia (optochin sensitive )
Beta :
- pyogens (Bictracin sensitivite)
- agalactia (CAMP test (+) )
Gamma :
- entirococci
-nonentirococci
☻ سنستڤ يعني اكو inhibition zone
Staphylococcus :
Catalase (+)
Mc agar : not growth
MSA : selective for Ⓖ+
Differential for staphylococcus spp.
S.aureus : mannitol fermenter (yellow) , caugulase (+) , Beta haemolysis on blood agar.
S.epidermes : mannitol non fermenter (red) , caugulase (-) , no haemolysis on blood agar .
E.coli :
Mc agar :
Selective to G(-) entirobecteriacea
Differential to lactose fermenter (pink) and non lactose fermenter (colorless)
E.coli colony is ( dry, pink 'lactose fermenter' ) on Mc agar .
On EMB : green metallic sheen .
Biochemical tests :
- ferment (glucose , lactose , fructose)
- IMViC (+ + - -)
- indole (+)
- methyle red test (+)
- simmons citrate (-)
- vogas-proskauer test (-)
- motile
TSI : A/A + Gas production
