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This week's campaign opens a new front in Syria and thrusts Washington into the country's 3-year-old civil war.
The U.S. and Arab allies opened a new front against militants by joining Syria's three-year-old civil war.
Between 550,000 and 1.4 million people in West Africa could be infected with the virus by 2015, according to a report issued on Tuesday.
Bahrain, Jordan, Saudi Arabia, the United Arab Emirates and Qatar had participated in or supported the strikes against Islamic State targets.