The full name of acute nephritis is post-infectious glomerulonephritis, so as the name suggests, acute nephritis is related to infections. The most common cause is acute streptococcal infection. There are also infections caused by Staphylococcus aureus, Staphylococcus epidermidis, and Gram-negative bacteria. The main pathogenic mechanism is due to a series of immune responses caused by streptococcal infections, leading to an immune complex-mediated glomerulonephritis. The most common sites of infection are the respiratory tract and skin, with a latent period of one to three weeks.