This week, U.S. healthcare workers began receiving the first doses of Pfizer's COVID-19 vaccine — and we almost certainly have monkeys to thank for that. Monkeys and other nonhuman test subjects have been an extremely valuable research component in helping the medical community better understand COVID, which has so far killed 290,000 people in the U.S. and more than 19,000 in Florida. In two peer-reviewed studies published this spring in Science magazine, researchers who infected groups of rhesus macaque monkeys with the coronavirus found that primates were capable of developing protective...