Abstract
Seven sporadic cases of ''seronegative glandular fever'' were examined in detail; 5 of the patients were adults aged more than 30, 2 were children. None showed evidence of ''incomplete'' or heat-labile sheep cell ag-glutinins, but in 3 very weak, though otherwise typical, glandular fever agglutinins were detected. Three of the other 4 showed evidence of certain infections, but these infections probably accounted for no more than a part of each illness. It is suggested that some, and possibly most, sporadic cases of seronegative glandular fever are of the same disease as seropositive cases, the patients'' ages influencing the sero-logical response. Certain conditions of known etiology may, however, be clinically and hematologically indistinguishable from seronegative glandular fever.
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