inflammation of what tonsils is caused by a streptococcus infection
Causes and Symptoms of Tonsillitis. Bacterial and viral infections can cause tonsillitis. A common cause is Streptococcus (strep) bacteria. Other common causes include: 1  Adenoviruses. 2  Influenza virus. 3  Epstein-Barr virus. 4  Parainfluenza viruses.5  Enteroviruses. 6  Herpes simplex virus.auses and Symptoms of Tonsillitis. Bacterial and viral infections can cause tonsillitis. A common cause is Streptococcus (strep) bacteria. Other common causes include: 1  Adenoviruses. 2  Influenza virus. 3  Epstein-Barr virus. 4  Parainfluenza viruses. 5  Enteroviruses. 6  Herpes simplex virus.