You are called out to investigate and abortion storm in a gr…
You are called out to investigate and abortion storm in a group of heifers in northern California. The owner reports that all those affected are from a group of bred heifers that he bought 3 months ago from Montana. He also reports that his biosecurity was recently compromised when several of his neighbor’s calves broke into his pasture about a month ago shortly after they were purchased from a local stockyard. The aborted fetus you examined has enlarged lymph nodes and petechial hemorrhage in their oral cavity. Which of the following would most likely yield a definitive diagnosis.