The antiparasitic drug ivermectin failed to treat COVID-19 in yet another randomized clinical trial, but the drug remains popular amid the pandemic thanks to Republican politics. That's the takeaway from two separate studies published Friday in JAMA Internal Medicine.

Together, the studies raise yet more concerns for the use of ivermectin against the pandemic virus—as well as the reasons behind its use, which appear politically motivated.

"Political affiliation should not be a factor in clinical treatment decisions," the Harvard researchers behind one of the studies concluded. "Our findings raise concerns for public trust in a non-partisan health care system."