Don't know if you followed this through till now. It was a terrible lose to everyone involved. Horses/owners/trainers, merchants the list is almost endless. It all got traced back to one horse who slipped through quarentine. It has progressed to the point that some of the teams and individual riders have chosen not to ride in the summer Olympics or that they have bypassed their qualifiers trying to get it under control.
We always have a bout of it here in the States but right now I think we are in the clear with Delaware being the last to lift quarentines. Scarey part is that they say 90% of horses have been exposed or are carriers and it just takes that one little stresser to cause the body to shead the virus.