Disease-control software in cell phones is touted as boon to global public health . half of world 's cell phones are in developing countries . Health workers in Washington stopped spread of polio in more than 20 years using CNN . ( CNN ) -- East African health care worker : Relaying information at appropriate time is life-saving .
Disease-control software in cell phones is touted as boon to global public health . half of world 's cell phones are in developing countries . Health workers in Washington stopped spread of polio in more than 20 years using CNN . East African health care worker : Relaying information at appropriate time is life-saving .