In short, yes, it is. Although strep throat is relatively harmless when it is treated in a timely manner, it can cause some serious complications when it’s left untreated. Our AFC Urgent Care Indian Trail team further explains below, so keep reading! How Common Is Strep Throat? Strep throat is a relatively common infection, as between 11,000 and 13,000 cases happen each year. Strep throat is a bacterial infection caused by a ...