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Anti-M in children with acute bacterial infections
Abstract:
Four children, 7 to 24 months old, were found to have anti-M at the time of admission to the hospital for severe acute bacterial infections. All were M-N+. Two patients had meningitis, one had septic arthritis, and the fourth had a third-degree burn of the left hand. In follow-up studies the anti-M of patients No3 and No4 were no longer detectable after 12 and 11 months respectively. In all patients no demonstrable antibody was in either maternal or cord sera at time of birth. The clinical data and bacterial isolations lead us to postulate that bacterial infections account for the formation of naturally occurring anti-M in M-negative persons.
Insights
Severe bacterial infections in infants may trigger the natural formation of anti-M antibodies in M-negative individuals. Antibody levels decreased over time in affected children.
Area of Science:
- Immunology
- Pediatrics
- Transfusion Medicine
Background:
- The MNS blood group system is important in transfusion medicine.
- Naturally occurring antibodies can cause transfusion reactions.
- Anti-M antibodies are typically considered rare in M-negative individuals.
Observation:
- Four infants (7-24 months) with severe bacterial infections presented with anti-M antibodies.
- All infants were M-N+ and had serious infections like meningitis, septic arthritis, or severe burns.
- Maternal and cord sera lacked detectable anti-M at birth, suggesting postnatal antibody formation.
Findings:
- Anti-M antibodies were transient, becoming undetectable in two patients after 11-12 months.
- The presence of anti-M correlated with acute bacterial infections in M-negative children.
- No anti-M was detected in maternal or cord blood, ruling out passive transfer.
Implications:
- Bacterial infections may be a trigger for the development of naturally occurring anti-M antibodies in infants.
- This finding has implications for blood typing and transfusion practices in pediatric patients with infections.
- Further research is needed to understand the immunogenic mechanisms linking bacterial infections to anti-M production.