There were no treatments or vaccines to protect people during the recent hantavirus outbreak on a cruise ship. There hasn’t been enough sustained investment to pay for the extensive safety and efficacy testing needed, in part because the viruses are rare and don’t spread easily between people. Still, researchers in Chile, Argentina and the U.S. have some promising candidates. And some research published Wednesday gives a hint that a drug for autoimmune diseases might help hantavirus patients fight the most deadly symptoms. Scientists hope the outbreak will spur new interest and funding.