The voluntary double-blinded study will begin in late October.

Upon completing a second round of sampling, the FDA again deemed dairy products safe to consume.

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

The federal agency also looked to shine light upon "milk myths."

A federal order taking effect states dairy cattle must receive a negative test before interstate movement.

Organizations cite measures in the federal-state milk safety system.

Direct exposure to dairy cattle likely led to an infection.

FDA recommended not manufacturing or selling raw milk or raw/unpasteurized milk cheese products made with milk from cows showing symptoms.

Experts stressed there are no concerns about the safety of the commercial milk supply.