Anti-A, anti-B, antibody appear in child ?: (A) Just after bih, (B) 1 week after, (C) 6 week after, (D) After 6 months
Answer is D. Ans. is 'd' i.e., After 6 months Titre of anti-A and anti-B antibodies is almost zero immedietly after bih. Infants sta producing anti-A and anti-B antibodies at age of 2-8 month when corresponding antigen is not present in cell. Maximum titre rech at 8 to 10 years of age after that it staed declinning.