With a fatal hantavirus outbreak setting off public health alarms, could ivermectin be a solution? As  18 people  who were aboard a hantavirus-stricken cruise ship prepared for their May 11  return  to the United States,  some  on  social media  said the antiparasitic drug ivermectin could be an effective treatment for hantavirus. Only it’s not. We spoke with four doctors who told us there are no specific drugs or cures for hantavirus, which is spread primarily by rodents. But doctors treat hantavirus patients’ symptoms with supportive care, including providing supplemental oxygen or administering blood pressure medication. One of the U.S.-based passengers  tested positive  outside the U.S. but isn’t currently experiencing symptoms; another person is displaying some hantavirus symptoms without a clear cause, health officials  said .…