Summary A girl, now 3 years of age, is described, who since the age of 3 months had many, often severe, infections mainly caused by microorganisms with a polysaccharide structure. In addition she had very low IgM and no iso‐agglutinins in her serum, and furthermore we were able to show an abnormal chromosome number 1 in more than 80% of the cells investigated from peripheral blood. The possibility that antibodies to polysaccharide antigens are directed from chromosome number 1 is referred to in this paper.
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FOUL AABEL ØSTERGAARD (1973) studied this question.
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