dr. tracy lu is a researchers at kaiser. >> some of the clusters aren't what we had necessarily predicted reporter: with one more week of quarantine jennifer simon hopes her daughter will be okay. >> we've been lucky she hasn't contracted measles. so it's been an inconvenience but not a tragedy. i don't want it to be a tragedy for anyone else. >> california is now trying to make it harder for parents to get those personal belief wave waivers. now they need a doctor's release saying their kids are not at risk. for "cbs this morning: saturday" ben tracy. >>> the "guardian" of britain reports mastercard is ready to do business with cuba. it will begin processing swipes by u.s. cardholders in cuba starting in march. it's the first major credit card company to do business there since president obama ended the half century-long diplomatic freeze with cuba. >>> the "international business times" reports the please in hong kong are on the hunt for a 12-year-old girl and her accomplices who may be wearing one excessive piece of jewelry. police say two women and a man distracted the staff at a high

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dr. agus is with us. how do you see this connection? pa . >> it's from a family of enterovirus. pole low is an enter row vie lus. we know it can affect a neurological system. in fact. there was an outbreak earlier this year in colorado where several kids got paralysis and they got this particular virus. we can't actually prove it causes this neurological symptom. but they present. they have symptoms of the virus. they have virus in the blood and characteristic changes on mri. it's certainly scary. it's spreading throughout the country. this virus can have serious symptoms. >> david, these kids had fever and illness two weeks before developing this limb weakness. what should parents dosome. >> this is different than classic virus. i talked to my brother who heads the medical intensive care unit at boston children. it takes several days and you get sicker and sicker and you call your pediatrician or go to the emergency room. this virus is 0 to 60 in less than 24 hours and classically most of the kids don't have fever. they just present with difficulty breathing. so be aware if your child is sick at all, keep them