ST. PAUL (AP) — Minnesota health officials say the state has three more presumed cases of bird flu.

One flock is in Otter Tail County and the other two are in Stearns County. The Stearns County flocks total about 35,000 turkeys. The size of the Otter Tail flock is pending.

The cases are subject to confirmation by the USDA.

Both counties have already had infected flocks. Seventy farms and 19 counties have come up with the virus, which has killed almost 4 million birds, mostly turkeys, in Minnesota. That's about 8 percent of the state's annual production.