NAVLE® Question of the day

A farmer recently purchased a sheep from a salebarn. The sheep soon became ill, with progressive depression, lethargy, and inappetance.
He had respiratory problems, breathing hard with abdominal effort, and died after three days with a frothy nasal discharge just prior to death.

At necropsy, the lungs had the appearance shown below.

What was the most likely cause of death?

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