Another Michigan farmworker has been diagnosed with bird flu, the third human case associated with an outbreak in U.S. dairy cows, health officials said Thursday.

The dairy worker reported a cough, congestion, sore throat and watery eyes. The other two patients had only eye symptoms, health officials said. The farmworker was given antivirals and is recovering from respiratory symptoms, health officials said.

The risk to the public remains low, although farmworkers exposed to infected animals are at higher risk, health officials said. The Michigan cases occurred on different farms and there are no signs of spread among people, officials said.

“Risk depends on exposure, and in this case, the relevant exposure is to infected animals,” the Centers for Disease Control and Prevention said in a statement.