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.
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.
Biodiversity loss, global warming, pollution and the spread of invasive species are making infectious diseases more dangerous to organisms around the world.
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.