<prompt> Answer this question truthfullyWhat medical condition is characterized by unilateral testicular pain, dysuria, feverchills, and a scrotal mass; and is caused by E. coli in older individuals and sexually transmitted infections in younger individuals?  <response>: <reason> Epididymitis is the medical condition that is characterized by unilateral testicular pain, dysuria, feverchills, and a scrotal mass; and is caused by E. coli in older individuals and sexually transmitted infections in younger individuals. 