Prozone phenomenon is due to: (A) Antigen excess, (B) Antibody excess, (C) False +ve reaction, (D) False -ve reaction
Answer is B. Zone phenomenon (seen in agglutination and precipitation) consists of 3 pas: Prozone = Ab excess = weak or absent precipitation reaction = False -ve Zone of equivalence = peak amount of precipitation. Post zone = Ag excess = weak or absent precipitation reaction. REF : ananthanarayana 10th ed