The CDC stressed that the overall human health risk of the bird flu remains low.
Unlike poultry, the cattle do not need to be culled and are expected to make a full recovery.
The Minnesota Board of Animal Health noted that the risk to the public is “extremely low.”
Scientists have warned that the impact of the bird flu on Antarctic wildlife could be "immense."
Avian influenza has affected tens of millions of birds and thousands of mammals worldwide in recent years.
Researchers found about 35 penguins dead in the Falkland Islands on Jan. 19.
Since 2021, Europe and the Americas have been suffering from a nearly continuous outbreak of H5N1 avian influenza.
It's likely the polar bear was infected after scavenging dead birds, according to local officials.
In October, the first ever recorded case of bird flu in the Antarctic region was detected in brown skua birds.
Last week, two outbreaks of H5N1 avian influenza were reported in Israel.