Cause Streptococcus bacteria produce chemicals or toxins that irritate the cells that line the throat. As the body's immune system attempts to force out these intruding bacteria, more and more blood goes to the area, making it appear extremely red. Although adults get the disease, strep throat is more common in children. It is very contagious and is often spread among siblings or classmates. Although many viruses also cause a sore throat, strep throat is the most common bacterial infection that leads to a sore throat.
Some children have convulsions or nausea .
Some show no symptoms at all. Coughing and a runny nose are not characteristic symptoms of strep throat. Symptoms your physician may observe If strep throat is suspected, it should be checked by a physician. A doctor may notice white spots on either side of a red throat and detect tender lymph nodes. However, to be sure it is strep, a physician must test for it.