The HLA-SD phenotype distributions of hebephrenic and paranoid schizophrenics, and of the two groups combined, in an Italian population and in a combined group from the Swedish population have been analyzed statistically. There is a significantly decreased frequency of HLA-A10 in all of these. Theae are some preliminary indications of an increased frequency (a positive association) for some of the other antigens of the HLA-SD series, but there is insufficient data at present for evaluating the significance of these findings. Differences between hebephrenic and paranoid schizophrenics have been detected.
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Smeraldi et al. (1976) studied this question.
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