i spoke with sean mcdonald who spent more than 10 years building, deploying and critiquing mobile technologies and humanitarian disasters. busters infectious disease control, when the patient has positive interview a person to know where they've been during that period. and then we use that information to try and track down other people that might have had contact with in terms of the big change in contact tracing apps from, from analog to digital is that we're moving from a process that connects people to treatment through a process that communicates risk and communicating risk in the absence and treatment capacity has a very different effect on a population. it can cause fear, it can cause people to go see more treatment and otherwise my and so i think that there's a lot to be examined about the fundamental sort of assumptions that go into the digital transformation that has stopped governments and health authorities from jumping on board from italy to india, more than 150 calling up enabled systems have been developed to track the spread of curve at 19 summary, such as claim that in places

sean duffy, byron donald, liz mcdonald and dan heninger are here among many others. it is thursday july 8th, "varney and company" about to begin. ♪♪ ashley: get ready. the temptations, classic band group. good morning, blue skies in new york city. tropical storm elsa in whatever form she comes heading to the northeast. check futures, plenty of red, the dow off 520 points, same story for the s&p and nasdaq. let's bring in our good friend, dr barton. we have a selloff this morning. i know you are a bull, does this were your is it just a blip on the radar? >> i will go with blip on the radar. you covered a lot of things going on, you had the bond yields dropped yesterday and a lot of people on the equity side are very much in tune with what the bond market is telling us when yields go down and bond prices go up, bond traders looking at a less robust economic recovery so i think the market, we just hit 7 straight record highs, everything was zooming up, very natural to have a little pull back, not scared at all. ashley: the rotation back in full force. how long does that