This American doctor thought he was going on vacation. He ended up treating hantavirus patients

By Lex Harvey, CNN (CNN) — Dr. Stephen Kornfeld boarded the MV Hondius in the southern tip of Argentina last month anticipating a once-in-a-lifetime adventure, exploring vast icy expanses and remote islands, seeing wildlife like whales, dolphins and penguins up close. But a few weeks into his vacation across the Atlantic Ocean, the Oregon doctor