Alongside more dairy herd confirmations, the USDA noted three more H5N1 outbreaks in poultry, all on Minnesota turkey farms.
The additional cat detections are from 2 states battling the virus in cows: Minnesota and Michigan.
The rise in invasive H influenzae disease came amid eased COVID measures, with babies and seniors the most affected groups.
The outbreak at the poultry farm, with more than 1.7 million birds, prompted an emergency declaration from Colorado's governor.
The authors say the virus can bind to both avian and human-type cell receptors but doesn't easily spread through respiratory routes.
The patients are young cousins from the same household who had contact with dead poultry before they became ill.
The infected farm worker is from Colorado, which has had the most affected dairy herds in the past month.
Moderna's work on a prepandemic vaccine began last year, and the new award has an option for large-scale production, if needed.
The FDA said the study compliments an initial study the agency did this spring testing 297 samples of commercial dairy products.
The USDA said it will start accepting applications for compensation on July 1.
