Review Question - QID 210795

A 44-year-old woman presents to her primary care physician because she has been having fever, chest pain, and cough for the last several weeks. She presented to the physician because she discovered blood in her sputum after coughing. She recently returned from a year of traveling abroad, but has otherwise been healthy. Based on clinical suspicion, an acid fast stain is performed showing the causative organism, and she is started on appropriate therapy. Two weeks later, she returns with a skin rash, diarrhea, and confusion, and is given a factor to take in addition to the medications previously prescribed. Which of the following is a characteristic of the factor that was most likely provided?