Even smaller devices running on batteries and with WIFI access can be carried by consumers in their pockets, brief cases or back-packs.

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The U.S. cases are detailed in a brief report from the CDC and other researchers in Thursday's New England Journal of Medicine.

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Dr Martin Fisher, a consultant in HIV medicine, said that this brief period was a "golden opportunity" to spot new cases.

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The Obama administration agreed, saying i n a brief urging the court to deny cert. that the two cases have virtually nothing to do with each other.

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