<prompt> A child with history of recurrent throat infrctions presents with hematuria and proteinuria with the last infection being 3 weeks back. The diagnosis is-Bergers diseaseHenoch Schonlein purpuraMembranoproliferative glomerulonephritisPoststreptococcal glomerulonephritis  <response>: Ans. is d i.e., Poststreptococcal glomerulonephritis Post streptococcal glomerulonephritiso PSGN appears 1 to 4 weeks after a streptococcal infection of pharynx or skin impetigo. It is caused by certain nephritogenic serotypes of group A -hemolytic streptococcus not by all serotypeso The lesions are caused by immune complex deposition and activation of complement complement level decreaseso It occurs most frequently in children 6 to 10 years of age.o Clinically child presents with acute nephritic svndromei Hematuriaii Oliguric acute renal failureiii Azotemiaiv Proteinuriav Hypertensionvi Edemao PSGN causes acute renal failure, but not chronic renal failure-more than 95 of affected children eventually recover totally with conservative therapy.Treatmento Management is directed at treating the acute effects of renal insufficiency and hypertension.?o Although a 10 day course of systemic antibiotic therapy with penicillin is recommended to limit the spread ofnephritogenic organisms, antibiotic therapy does not affect the natural history of glomerulonephritis 