A new study is inviting pet owners in the greater Seattle area who test positive for monkeypox to have their animals screened for the virus. The Monkeypox and Pets Study is accepting enrollees in King County, Wash. Owners of dogs, cats, ferrets, rats, mice and hamsters may participate. The study will not include reptiles or birds.

"We're enrolling local households where someone has been diagnosed with monkeypox. Our team can go out and provide free testing of the animals and be able to tell with this study how big a problem this is," said Dr. Peter Rabinowitz, a professor at the University...