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The physical therapy as you just heard there. you can get some pretty good results. it takes time. sometimes the weakness will come and go, but the physical therapy can help in certain situations. >> obviously i don't want to freak out-patients. -- out parents. what should parents watch out for? >> it's interesting. part of the reason this got back in the news again this is going to be presented at a conference. one of the things they're trying to do is first of all get a message to doctors and parents that if you've seen something like this in your own community away from california, go to th...

To have weakness that's just unusual, unexpected, one girl they were describing had weakness of her hand grip. that sort of thing you need to go get that checked out. you wouldn't blow that sort of thing off any way but certainly not in this case. >> sanjay, thanks. up next tonight amanda knox's ex-boyfriend and co-defendant has he started doubting her innocence or trying to help his own case in italy? also suspicions the legendary ali-liston heavyweight bout might have been rigged. details ahead. hey guys! sorry we're late. did you run into traffic?

On this? what should they watch out for? >> it's interesting. part of the reason this got back in the news again this is going to be presented at a conference. one of the things they're trying to do is first of all get a message to doctors and parents that if you've seen something like this in your own community away from california, go to the hospital, get it checked out. maybe you'll find this particular virus and be able to start confirming these cases. but i think for other parents out there, if your child seems to have weakness that's just unusual, unexpected, one girl they were describin...