Came on here to debate races, probably not much point in that until this clears up. Awful news. Hope it doesn't have a huge impact on the animals themselves and is contained pretty quickly.
From a selfish punting perspective it is probably the worst situation for many reasons, first off already sitting on a loss through horses that sustained injuries or worse, plus cashed out bets, and secondly all the hours/time/debate/discussion of research and you lose any 'deserved' decent prices you may have that are no longer and likely never will be available again, should the festival not go ahead. I presume bets will be void only.
Don't get me wrong, my main concern is obviously all of the horses welfare, and I wish all of them speedy recoveries. Fingers crossed for some good news over the coming week or so.