Four news cases of equine influenza have been identified in vaccinated thoroughbreds at trainer Simon Crisford's Newmarket yard.

The Professional Jockeys Association (PJA) claims jockeys could be affected financially if racing is shutdown for longer than a week.

Tests on hundreds of horses have unearthed no new cases of equine flu, according to the British Horseracing Authority.

The British Horseracing Authority hopes their quick response will stop equine flu from shutting British racing down for months.