Henoch-Schonlein Purpura Nephritis the situation?

The disease often occur in children under 10 years of age, adults (> 20 years of age) rare. Good in the cold season. About 1 / 3 of patients like bacteria and virus infection pioneer history, but could not prove with certainty relations streptococcal infection. About 1 / 4 patients with fish, shrimp allergy or vaccination drugs. Most patients with benign, self-limiting process, most recover within a few weeks. But there are also recurrent or persistent few months, few years, about 50% of patients recurrent disease. About Henoch-Schonlein Purpura Nephritis in Henoch-Schonlein purpura in the incidence of reported mixed, Nantong Medical School Professor Qian Tong-sun Statistics reported 2,840 cases at home and abroad, who Purpura Nephritis of 37.6 percent.