The National Institutes of Health, which owns the chimps at the Alamogordo Primate Facility in New Mexico, has no plans to move the animals to sanctuary, despite a ruling from a federal judge.
Carlee, a chimpanzee living in Chimp Haven, a 200-acre sanctuary in Louisiana that serves as the designated retirement home for federally owned chimps.
The new case, in a Michigan farmworker, did not suggest that bird flu was widespread in people, health officials said, adding that the risk to the general public remained low.
The exact number of chickens, cows and pigs being transported on trucks, ships, planes and trains within the United States is difficult to pinpoint because there is no national system for tracking the movement of livestock.
Biodiversity loss, global warming, pollution and the spread of invasive species are making infectious diseases more dangerous to organisms around the world.
White-footed mice, the primary reservoir for Lyme disease, have become more dominant in the U.S. as other rarer mammals have disappeared, one potential explanation for rising disease rates.
Gov. Kristi Noem suggested that President Biden should have euthanized the family dog, as she did. Animal experts said that such an option should be a last resort.