It's complicated: Human Salmonella infections are caused by the species Salmonella enterica, which is divided into six subspecies. There are over 2500 distinct serotypes(distinct variants) of the species. The Widal Test tests for antibodies to the surface(O) antigen and flagella(H)antigen. Acute and convalescent sera should show a 4 fold increase in titer to be considered positive. See > http:///bit.ly/1kJgGtF .
Answered 1/8/2016
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