Clinical Sciences Question of the day

You are called to evaluate a multi-age broiler farm in the U.S. Young birds appear ruffled and unwell, but some are normal. Older birds who previously showed the same vague clinical signs are now acquiring an unusual amount of bacterial infections.

Upon necropsy, you discover hemorrhagic and shrunken bursae.

What type of etiologic agent is the most likely cause of this clinical presentation?

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