ANTI-A AND ANTI-B BLOOD GROUP ANTIBODY LEVELS IN RELATION TO AGE IN CYNOMOLGUS MONKEYS

Abstract
Anti-A and anti-B blood group antibody levels were determined with serum samples of 583 cynomolgus monkeys of group-A and group-B, aged from 4 days to 15 years or more. Eight group-A infants free from anti-B antibody at ages of 4 to 25 days were consecutively followed up for the appearance of anti-B antibody. It appeared at ages between 68 and 160 days. Both anti-A and anti-B levels rose with increase in the age and reached a maximum at the age of 4 to 5 years. After that the levels gradually fell with aging.