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holly phillips, thank you very much. >>> up next, big data. every day our smartphones and computers and cars gather information about us. where we are and what we are doing. a new documentary explores the human face of big data and it's quite a portrait. you're watching "cbs this morning: saturday." make it a point to shop kohl's... this thursday through monday!... because yes2you rewards members take an extra 20% off!... and earn triple points - no matter how you pay! get a $5 reward for every 100 points. plus - everyone gets $10 kohl's cash for every $50 spent! you can earn and redeem rewards points and kohl's cash throughout the store! there's no better time to sign up!... anyone can - it's quick and it's easy! enroll, save and start racking up the points today! what if there was another way to look at relapsing multiple sclerosis? this is tecfidera. tecfidera is not an injection. it's a pill for relapsing ms that has the power to cut relapses in half. imagine what you could do with fewer relapses. tecfidera may cause serious side effects,

n-x-/e0 >>> time for "morning rounds" holly phillips. the cdc is investigating more than a dozen cases of the zika virus that may have spread through sex. zika is suspected of causing severe birth defects. here is jon with more. >> reporter: this couple was living in brazil last summer when dustin was diagnosed with zika and anjelica was prosecuting. earlier this month, doctors told them to practice safe sex. >> the doctor suggested to us that use protection. >> reporter: the advice either to abstain from sex or use latex condoms during sex is given by the cdc to all pregnant women whose male partners have been to zika-infected countries. on february 2nd the first reported in dallas. with this week's 14 suspected cases, the cdc is rethinking how the disease spreads. jennifer mcquistan of cdc. investigating we are becoming more aware that sexual transmission may happen more often than we previously thought. >> reporter: zika has been linked to microcephaly in newborns with abnormally small heads and developmental delays. the virus remains

holly phillips, thank you very much. >>> up next a chilling texas murder mystery with multiple related to the justice system. ahead, the incredible story behind tonight's edition of "48 morning: saturday." a lot and quit a lot, but ended up nowhere. now i use this. the nicoderm cq patch, with unique extended release technology, helps prevent the urge to smoke all day. to be my last time. that's why i choose nicoderm cq. hello my love! the flame is out... is out, tomorrow my attitude... que? the stove. it's not working.veable soups. usic] no, no, no, no, and strong... yey! which is why our products are too. >>>tor was murdered in broad daylight one block from the courthouse in the town of kauffman near dallas, the fbi was stumped and theere began arming themselves and locking their doors. >> it was just the first of several brazen killings that rocked the town. tonight on "48 hours."chard schlesinger brings you the dramatic story of what happens when the hunter became the here is a preview. >> i comeuse here almost every day. i saw a person, clothes all in black. linda bush is no strang

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holly phillips. first up, concerns continue to mount at home and abroad over the threat posed by the zika virus. cbs news chief medical correspondent dr. jon lapook recently returned from brazil, the epi center of the outbreak, where he spoke with a doctor who found the link between zika and birth defects. >> reporter: pediatric neurologist dr. vanessa vanderland saw her physician case of microcephaly back in august and soon more infants unusually small head. her mother anna, also a doctor, phoned with troubling news. when you heard that, what did you think? you were, like, detected? >> yes, yes. >> reporter: after ruling out the usual causes, they looked for other clues. 70% of the women reported a rash during pregnancy, a symptom that helped lead them to the main suspect -- zika. melissa were born in october. this is her first child. if any mother or father could choose, she says, they would choose to have a normal baby, a healthy baby, but because you love my daughter. for "cbs this morning: satur

holly phillips. zika virus, scientists say more research need to be done. jon looked at what expectant mothers need to know about the virus. >> reporter: 30-year-old jessica is expecting twins in april and getting a blood test for zika virus, something she had never heard of a month ago. >> the zika virus adds an element of anxiety. this my first pregnancy, i feel very anxious about a lot of things. >> reporter: last month, she and her husband drew took a vacation to puerto rico, not knowing it had just been added to a cdc list of places with zika transmission. then a friend sent her this text message. jess, have you heard about zika? i don't want to scare you, but you should should mosquitoes. in brazil, zika virus has been linked with microcephaly, babies and head and those have lifelong medical problems. this doctor says some of her patients are panicked. >> i think a lot of patients are very concerned that they could contract zika virus here in the united states. we don't have any patients here in the continental united states who have actually contract