Abstract
A deficiency of all nine complement (C) components in cord sera relative to maternal serum levels was demonstrated. At 4 days of age, C1q (measured immunochemically), C1, C2, C4 and C7 levels were increased markedly to maternal levels. C3 was the only C component which exhibited no significant change between birth and at 4 days of age. A marked deficiency of serum levels of C8 and particularly of C9 was evident at birth.
No haemolytic C was demonstrable in the colostrum from which lipids were previously removed. Functional C3 was measurable by immune adherence with EAC142 intermediate sheep cells. Functional C3PA using cobra venom-induced lysis of unsensitized guinea-pig erythrocytes was also present. Substantial amounts of C3, C4 and C3PA determined immunochemically were found at 24 hr after birth with rapidly decreasing levels at 48 and 72 hr. C1q and C5 were absent. No differences of C components were evident in sera between bottle and breast-fed infants for any of the nine components studied.
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Selected References
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