Isolation of salmonella Typhi from Paratyphi on the basis of biochemical tests.
In TSI agar-
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Hydrogen sulphide (blackeng of the medium) -positive
in case of S. Typhi where as S. Paratyphi is negative.
Gas production is seen in S. Paratyphi but lacking S. paratyphi.
#SalmonellaTyphi
#Paratyphi
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![](https://i.ytimg.com/vi/zfUy-1oDGGg/mqdefault.jpg)