Doctors have reported the first U.S. cases of ringworm caused by an emerging and highly drug-resistant fungus. Super-ringworm is on the loose in New York City. In a report this week, doctors and health officials have detailed the first known U.S. cases of the itchy infection caused by a contagious and emerging fungal germ—one highly resistant to many existing drugs. The fungus was first identified in South Asia, but it’s possible that it’s now circulating locally in the area.… … while ringworm can be very contagious through direct contact, it’s usually mild and treatable with over-the-counter antifungals. But a newly...