The National Stud in Newmarket has been closed to the public following the discovery of an equine virus.
A statement from the National Stud said: “We regret to report that a case of neurological Herpes Virus infection has been identified in a maiden filly in the Heath Isolation Unit at the National Stud.
“The filly arrived from overseas on 20th January 2016 and is fully vaccinated.
“We are therefore observing the requirements of the Codes Of Practice and the main stud has now been closed on a precautionary basis; it is hoped that breeding activity can be resumed at the start of the covering season.
“We look forward to commencing tours in due course.”
The National Stud has been owned by the Jockey Club since 2008. Its main aim is to support the thoroughbred breeding industry.