A 42-year-old African American woman with a history of lupus calls the clinic to discuss her recent test for sexually transmitted infections. She is very upset as she has tested positive for syphilis,...

A 42-year-old African American woman with a history of lupus calls the clinic to discuss her recent test for sexually transmitted infections. She is very upset as she has tested positive for syphilis, and asks you how this is possible as she has been in a monogamous relationship for the last 20 years. What advice do you have to offer her?