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CULTURE CHARACTERISTICS OF COMMON BACTERIA

Contributed by:

Dr.K.B.RAVVA  M.B.B.S.
  022-24015460
  drkbravva@rediffmail.com
  drkbravva@hotmail.com
  drkbravva@yahoo.co.in

Media

à

 

----------

Org. ß

 

Trans-

port

Media.

Nutrient

Agar

(Ordinary

Media)

(NA)

Blood

Agar

(BA) /

Chocholate

Agar   (CA)

Mac-

Conkey

Medium

(Lactose-ferm’n)

Selective /

Enriched /

Enrichment

Media.

Remarks

Staph.

Aureus/Pyogenes

& Staph

Albus / Epidemidis

 

Golden Yellow

Colonies

b-Hemolysis

(Complete)

(BA)

Pink Colonies

(+ve)

--Black colonies on K-Tellurite media.

--Ludlam’s medium( salt milk agar)

 

Strepto.

Pyogenes

(Group A)

 

 

 

 

a / b Hemolysis

( BA )

a-hemolysis

strepto.viridans

 

 

Dick test

 for Scarlet-fever

Strepto.pneumoniae

 

 

 

 

a-Hemolysis

Greenish discolouration around colonies.

 

 

Carrom Coin app.

-Quellung

reaction.-capsule

N.meningitidis

 

Meningococci         

 

 

 

BA / CA used

Translucent

Convex colonies

 

 

 

N.gonorrhoea

 

Gonococci

Stuart’s

Transport media

 

BA / CA used

Translucent

Round colonies

 

Thayer-Martin

Media (  with               Vancomycin, Nystatin, Colistin )

5-10%CO2

( Candle jar used )

 

Cornyb.

diptheria

 

 

 

 

 

BA

 

--Loeffler’s Serum slope

--K-Tellurite Blood agar (0.04%)

( Macleod & Hoyle’s media)

Albert’s Stain for Metachromatic granules.

Shick-test( diphteriasusceptibility )

Elek’s gel ppt. Test & Guinea pig inoculation—for Toxigenicity / virulence.

 

Mycobacteria

TB.

 

 

 

 

  

 

 

 

 

--Lowenstein Jensen(L.J.)

solid media.

--Dubos Liquid media

--Loeffler’s serum slope

--Petroff’s medium

--Dorset’s Egg

medium

-Auramine & Rhodamine staining for Fluorescent microscopy.

-NAP test +ve, Niacin test & Neutral Red test +ve

Mycobacteria

Leprae.

 

 

 

 

 

 

 

 

--Foot Pad of Mice ( 20oC)

--Nine Branded Armadillo.

--Human Foetal spinal Ganglion Cells

Do not grow in cell free culture

Spirochaetes.

 

 

 

 

 

 

 

-No cultivation

--Only Dark Ground Microscopy of Smears .

Fontanas Method   (smears)

Levaditi

Staining

(tissue section)

Nichol’s Strain ( Rabbit Testes)

Chlamydia Trachomatis.

 

 

 

 

 

 

 

 

 

-Do not grow in cell-free media.

--obligate intracellular org.

-Inclusion bodies

in Giemsa stain smears

--ELISA.

Salmonella Typhi

 

 

 

 

 

 

NA.

 

Colourless

Colonies.

-Selenite F &

- Tetrathionate broth.

-Deoxycholate citrate agar

-Wilson&Blair medium(black colonies-s.typhi&s.paratyphi B.)

--Blood culture-Ist.wk.+ve—TSB-

Trypsicase soy broth

-Bile broth

Castaneda’s double medium.

 

 

Widal testà

(+ve at end of 1st wk.)

‘O’titre

> 1: 100

& ‘H’titer

> 1:200

is significant.

NOTE:-

BASU

1 2 3 4 wks.

B-blood

Culture

A-Antibody / WIDAL estm’n

S-stool

Culture

U-urine culture

 

Vibrio

Cholerae

 

 

 

1) VR-

venkatraam-ramakrishnan medium

2) Clary Blair medium

NA

BA-Partial

Hemolysis

( greening)

( eltor)

Colourless

colonies

1) Alkaline peptone water-surface pellicle

2) BSA-alkaline Bile Salt Agar,ph8.0)

3) TCBS medium-

Thiosulphate,citrate,bromthymaol bule & sucrose,

4) Monsur’s GTTA medium.

-String test

-Hanging drop  prep.-to see motility.

-strains-

Ogawa

Inaba

Hikojima

-Cholera red reaction-

nitroso-indole forma’n

Shigella

 

 

 

 

 

 

Colourless colonies

Except—Sh.sonnei( late lactose ferm’n)

-Deoxycholate citrate agar

 

E-coli

 

 

 

 

 

 

Pink

colonies

 

 

Klebsella

 

 

 

 

 

 

Pink

colonies

 

 

Proteus

 

 

 

 

NA

( Swarming Growth)

 

Colourless colonies

Tetrathionate Broth

Swarming inhibited by 6% Agar & Sodium Azide.

--PPA test +ve

(deamination test)

Pseudomonas

 

 

 

 

NA

( Greenish colonies—Pyocanin)

 

Colourless

 

Pigment produced are—Pyocyanin, Fluroscin, Pyoverdin, Pyomelanin.

Clostridium welchii

 

 

 

Stuart’s transport medium

& Thioglycollate broth.

 

 

 

Robertson’s cooked meat medium

( this medium turns PINK)

-Subterminal spores

-Lecithinase effect—Nagler reaction.

Cl.Tetani

 

 

 

Stuart’s transport medium

& Thioglycollate broth.

 

 

 

 

Robertson’s cooked meat medium

( this medium turns BLACK)

-Central spores

Drum stick app.

Citrobcater,

Enterobacter,

Serratia

 

 

 

 

 

 

Pink colonies