Health authorities scramble to contain the outbreak among passengers.
Singapore tests two passengers from the affected cruise for hantavirus.
69-year-old man in intensive care after evacuation from cruise ship.
Experts believe the hantavirus outbreak won’t escalate beyond containment.
South African analysis shows no changes in hantavirus genetic material.
Casual contact does not significantly spread the virus among individuals.
Learn more about the hantavirus outbreak and its implications.