Since 1941, 32 cases of infectious lymphocytosis have been reported as such in the literature.1 Other cases, probably the same disease entity but not so designated, also have been described.2 This syndrome occurs in children and young adults and is characterized by a decided increase in normal mature lymphocytes and a benign clinical course. In the present paper 2 cases running a parallel course in brothers are reported.
REPORT OF CASES
Gavin B., a white boy aged 6 years, was seen for a periodic examination on Oct. 5, 1945. At this time he had slight malaise associated with a mild infection of the upper respiratory tract. The family history was noncontributory. For several years he had had slight asthma with respiratory infections. A white blood cell count taken in August 1945 had been normal.The physical examination revealed a few wheezes in the chest, slight axillary