Acute poststreptococcal glomerulonephritis (acute glomerulonephritis, acute nephritis, postinfectious glomerulonephritis) is an immune complex disease with diffuse damage to the kidneys, primarily the glomeruli, which occurs 10-14 days after a streptococcal infection (tonsillitis, impetigo, scarlet fever, pyoderma, etc.) and is characterized by nephritic syndrome.