I am pretty sure that all Ty users including those from the trials is approx 52,000. So using this number with total pml cases would make the odds a little less than 1/5800. The number post trial is appox 40,000 Ty users with 6 pml cases making these odds around 1/6700. My mind just can't remember where I read the numbers on Ty. I hate when this happens and I just read it recently...sorry
Linda