Congenital rubella. Monoclonal antibody-defined T cell abnormalities in young adults.

In order to determine if congenital rubella infection is associated with persistent T cell abnormalities, T cell subsets were quantitated in 16 non-institutionalized subjects (ages nine to 21) with the clinical stigmata and history of congenital rubella. Flow cytometric analysis revealed a decreased T4/T8 ratio (mean +/- SEM in subjects with rubella, 1.57 +/- 0.15, p less than 0.01; in normal subjects, 2.3 +/- 0.4; in subjects with type I diabetes, 2.3 +/- 0.3), decreased percent of T4-positive "helper" cells (42.6 +/- 2.3) different from that in both normal subjects (52.6 +/- 2.4, p less than 0.01) and subjects with recent-onset diabetes (51.5 +/- 2.4), and increased percent of T8-positive "suppressor/cytotoxic" T cells (29.9 +/- 1.4, p less than 0.02) relative to that in normal subjects (24.2 +/- 1.5) and subjects with type I diabetes (23.9 +/- 1.4). Five of 16 subjects with congenital rubella had an elevation of la-positive T cells. Approximately 20 percent had antimicrosomal antibodies. One subject had diabetes mellitus and hypothyroidism, one had hypoglobulinemia, and one had previously undiagnosed hyperthyroidism. Glycosylated hemoglobin levels were normal in all except the diabetic subject, and none of the subjects was islet cell antibody-positive. The T cell abnormalities documented may predispose persons with congenital rubella to the development of organ-specific autoimmunity.