The agency said those who tested positive were involved in higher risk activities.

The cases were the first reported in the state.

Queso fresco and cojita cheeses from a California facility proved to be contaminated.

The two cases involved workers exposed to infected dairy cows.

The state has seen spillover of the dairy strain into commercial poultry facilities.

The trade association's webinars and workshop are for anyone in the dairy industry.

It is the fourth human case in the US this year.

Though unrelated, the infection marks the second in the state of Michigan.

The agency reported one cow out of 96 sampled had a viral tissue sample.

Two vaccine options are in the country’s stockpile.