In salmonella infection, true statement is:
Flagellar antigen forms chalky granular clumps
Somatic antigen is a protein
Absence of Vi antibody indicate poor prognosis
Serological classification is by Craige's scheme
Absence of Vi antibody indicate poor prognosis in salmonella infection is the true statement among the options given above. Option 1 Option 2 Somatic antigen (O Ag): Pa of cell wall lipopolysaccharide (LPS). Flagellar antigen (H Ag): Made-up of proteins: flagellin, confers motility. Option 3 The complete absence of the Vi antibody in a proven case of typhoid fever indicates poor prognosis Option 4 Phase variation: Conversion of isolates from one phase to another is achieved by using Craigie's tube method. Note: Vi Antibodies are not seen in normal population.
Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli)