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Animal and Plant Health Inspection Service
U.S. Department of Agriculture
USDA FAQ's and resources about coronavirus (COVID-19).  LEARN MORE

Contagious Equine Metritis (CEM)

CEM is a sexually transmitted disease of horses.  Any horse that is sexually intact and over 731 days of age originating from a region/country affected by CEM is subject to CEM quarantine before being allowed into the United States, unless the horse is on an import permit waiver as put forth in the Code of Federal Regulations Title 9, Part 93.301.

Each individual CEM quarantine facility is State operated and overseen by the USDA. The documents listed below are reference material for State CEM coordinators. If you need to obtain import requirements for horses originating from regions affected by CEM, please refer to "CEM Protocols" for the country of origin selected under "View Requirements" on the homepage.

Learn more about CEM

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