A cruise ship outbreak of hantavirus has rattled the public and reignited fears of another global health scare as passengers disperse across multiple countries, including the U.S.  The World Health Organization reported 11 cases linked to the outbreak as of Tuesday, nine of which it confirmed, including three deaths. No Americans have tested positive as of Wednesday. Other passengers are being monitored in specialized medical units, including 18 in the U.S. across Nebraska and Atlanta. A handful of people not connected to the cruise are also being evaluated for possible exposure across several states. Treatments specifically for hantavirus are still years away: Shares of Moderna rallied around 12% on Friday after it confirmed it was conducting early research on a potential vaccine to protect against hantavirus. But as the number of exposed individuals and public concern grow, health experts aim to tamp down fears of another pandemic.…