A 22-year old African male on vacation in New York comes into the clinic on his third day in the country complaining of a painful ulcer on his penis. The lesion is soft and bleeds easily upon inspection. The doctor, who is very careful to wear gloves during the examination, takes scrapings from the lesion and sends them to the lab for diagnosis. Hours later, the lab sends back results of a Gram stain that indicate that they have found small Gram negative rods in strands. The doctor immediately prescribes a course of azithromycin. The doctor also warns the man to abstain from sexual activity until the ulcer has healed (which it will do, likely leaving only a small scar) and the course of antibiotics has been completed. What does the man have and what is the causative agent?