Two cats that belonged to Michigan dairy workers died after being infected with bird flu. But it's still not clear how the animals got sick or whether they spread the virus to people in the household,

The study provides growing evidence of the threat it poses even when cats have no direct exposure to sick dairy cows or poultry.

A new report details the bird flu cases of two pet cats in Michigan whose owners work in the dairy industry. Earlier in the month, a data table from the report may have appeared on the CDC website before being taken down.