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Swa: a subdivision.

M Contreras, P Teesdale, M Moulds

|January 1, 1987

Summary

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Anomalous reactions in Sw(a+) blood testing revealed Swa antigens are heterogeneous. Further study subdivided Sw(a+) into two inherited categories, improving serological understanding.

Area of Science:

Immunology
Genetics
Hematology

Background:

Anomalous serological reactions have been noted with anti-Swa sera against different Sw(a+) red blood cells.
Previous observations indicated potential heterogeneity within the Sw(a+) blood group antigen.

Purpose of the Study:

To investigate the heterogeneity of the Swa antigen.
To clarify the observed anomalous serological reactions in Sw(a+) testing.

Main Methods:

A comparative collaborative study was conducted.
Four reference laboratories participated using identical Sw(a+) red cell samples and anti-Swa sera.

Main Results:

The Swa antigen was confirmed to be heterogeneous.

Related Experiment Videos

Two distinct categories within Sw(a+) were identified: Sw(a+) 700:41 and Sw(a+) 700:-41.

Both identified categories were demonstrated to be inherited.

Conclusions:

The Swa antigen system is more complex than previously thought.
Subdivision of Sw(a+) into two inherited categories refines blood group antigen classification.
This finding aids in understanding and resolving anomalous serological test results.