A syringe of of ivermectin — a drug used to kill worms and other parasites — intended for use in horses only, rests on the box it was packaged in, Friday, Sept. 10, 2021, in Olympia, Wash. Health experts and medical groups are pushing to stamp out the growing use of the parasite drug to treat Covid-19, warning that it can cause harmful side effects and that there's little evidence it helps. (Ted S. Warren/Associated Press)

September 11, 2021