[Study of the carrying of respiratory tract viruses in steroid-responsive and simple nephrotic syndrome].

This study aimed to investigate the relationship between the carrying of respiratory tract viruses and the quantitative change of urinary protein of the steroid-responsive and simple nephrotic syndrome (SRSNS), and to assess the function of respiratory tract viruses in the triggering of the SRSNS, 37 children with nephrotic syndrome underwent the examination of respiratory tract viruses (APAAP method) once a week when they were hospitalized from August 1997 to March 1998. Among them, 17 children had simple nephrotic syndrome and 10 had nephritic nephrosis. Moreover, 18 children with respiratory infection in the same season were chosen as the control and were subjected to the examination of respiratory tract viruses by the same method. In the cases of SRSNS, the percentage for the carrying of respiratory tract viruses increases obviously in the acme, the percentage for the carrying of respiratory tract viruses of SRSNS has close relationship with the quantity of urinary protein (P < 0.05). There is no difference between the constitution of the category of the viruses carried in the acme of SRSNS and that of the viruses in the control (P > 0.05). The most frequently detected respiratory tract viruses in the acme of SRSNS is RNA virus, and that in the control is the same (P > 0.05). In the acme of SRSNS, most children have no symptoms of respiratory infection although respiratory tract viruses were detected. In the SRSNS, the percentage for the carrying of respiratory tract viruses increases obviously in the acme, it has an important relationship with the quantitative change of urinary protein. The category of the respiratory tract viruses detected in the SRSNS has a relationship with the season, this may be the reason why the cases of SRSNS so easily happen and relapse in this season. RNA virus perhaps plays an important role in the triggering of this disease, including the respiratory tract viruses infection and the carrying of respiratory tract viruses without the symptom of respiratory infection.