The problem of contagious equine metritis (CEM) has not gone away. In fact, it has become more confusing as the weeks have progressed since a "CEM-like organism" was found in a Mammoth donkey jack in California in December 1997. In a separate and unrelated incident, a second CEM-like organism was recovered from a jack in Kentucky in January 1998. The two jacks had no known association or

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