A mother brings her 14 year old boy into the clinic because he's been complaining of a fever, sore throat, and headache. He also has pain when chewing; he hasn't been eating much. He says it hurts when he drinks apple juice or orange juice. On exam, you see this at his right neck:
As a well-trained medical student, you ask the mother to step outside while you ask the boy about sex, drugs, and rock-and-roll. He whispers, "Well, there is this one thing...my balls really hurt." You see that he has a swollen left testicle and swollen inguinal lymph nodes on the left side.
Challenge: What is the causative agent of this disease?
1. What is seen in the image?
2. What is the testicular finding called?
Image shown under fair use.