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Brown good evening, scott is on assignment. Im james brown. Today, the food and Drug Administration took the extraordinary step of ordering the nations blood banks to begin screening for zika, even in places where the virus is not present. Zika can cause severe birth defects, and to date there have been nearly 2500 infections in the u. S. Linked to travel in countries affected by the outbreak. 42 were locally transmitted in florida, most likely from mosquitoes. Dr. Tara narula is a cbs news medical contributor. And i guess the first question up is why has the f. D. A. Called for a nationwide testing . These are updated recommend aegzs that come from the recommendationing in february. And it comes in the light of new scientific evidence, and the fact that were learning more and more about zika and how its transmitted. We know its transmitted sexually now. We know the devastating consequences that it can have on pregnant women, ....