Which is true about Widal reaction -: (A) Antibody to H Ag appears first and persists, (B) Antibody to 0 Ag appears first and persists, (C) Antibodies to H & 0 Ag appears simultaneously and persists, (D) None of the above
Answer is A. Ans. is 'a' i.e., Antibody to 'H' antigen appears first and persists