Increase in proteinuria and/or microhematuria following upper respiratory tract infections in patients with IgA nephropathy.

Exacerbation of urinary abnormalities after upper respiratory tract infections in patients with IgA nephropathy was examined. Twenty patients with IgA nephropathy and fourty patients with other glomerular diseases were evaluated in this study. The incidence of exacerbation in microhematuria after upper respiratory tract infections was significantly higher in patients with IgA nephropathy than those with other glomerular diseases. The improvement of microhematuria after upper respiratory tract infections was significantly delayed in some patients with IgA nephropathy. It is indicated that upper respiratory tract infections might be a risk factor of exacerbation in patients with IgA nephropathy.