A researcher at the Wisconsin National Primate Research Center (WNPRC) at the University of Wisconsin-Madison, performs an ultrasound on a pregnant rhesus macaque monkey infected with the Zika virus on June 28, 2016 in Madison, Wisconsin.Scott Olson / Getty Images Between 2000 and 2020, an estimated 482,000 primates were imported into the U.S. to be experimented on in testing laboratories.
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