************######################WIDAL TEST(116)##########

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   WIDAL :-	 TITRE		1/20	 1/40	 1/80	 1/160  1/320  1/640
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	  'S' TYPHI 'O'        -	  -	   -	   -	    -	     -
	  'S' TYPHI 'H'	       -	  -	   -	   -	    -	     -
	  'S' PARATYPHI 'AH'   -	  -	   -	   -	    -	     -
	  'S' PARATYPHI 'BH'   -	  -	   -	   -	    -	     -
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 Rising titres are diagnostic ('O' 1/80  'H' 1/160)
 'O' & 'H' agglutination usually persist for more than 6 months.
- Widal is positive in healty carriers.
- Early treatment may affect titres.
- In TAB vaccination all agglutinis are present.
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