What is the etiologic agent of Contagious Equine Metritis and how many strains are described?

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Contagious Equine Metritis is caused by Taylorella equigenitalis, a fastidious gram-negative bacterium that colonizes the reproductive tract of horses and is transmitted during breeding. There are two described strains of Taylorella equigenitalis in the literature. The other organisms listed are not associated with CEM, so they do not fit as the etiologic agent.