Adults dealing with post-streptococcal gn as a result of an untreated strep infection usually find the disorder resolves itself within a few weeks or months, but in. Be advised that adult tonsillectomy recovery is far more complicated and takes more time than childrens. Rheumatic fever is a rare inflammatory condition that usually develops in about 4-6 weeks following a case of untreated strep throat or strep throat that was not properly treated. Strep throat is a common type of sore throat in children, but its not very common in adults. Doctors can do a quick test to see if a sore throat is strep throat. If so, antibiotics can help you feel better faster and prevent spreading it to others. Untreated strep throat is contagious for two to three weeks, according to experts. One of the most noticeable strep throat symptoms in adults is that the sore throat comes on quickly and lasts 48 hours or more (a viral, non-strep sore throat usually starts with a little irritation and lasts only a day or two). Strep throat in adults can present itself in several variations. Generally speaking, it is a bacterial infection that occurs in the throat and tonsils. Streptococcal bacteria can cause strep throat, irritation and inflammation. While strep does cause pain in the throat, sore throats are typically viral infections and. 7 symptoms of strep throat in adults a suddenly very sore throat and fever are two of seven symptoms that can signal strep throat.