Six-year-old Diego Sanson receives an influenza vaccine injection at Massachusetts General Hospital in Boston, Massachusetts Jan 10, 2013. With flu cases in this city up tenfold from last year, the mayor of Boston declared a public health emergency Jan 9 as authorities around the United States scrambled to cope with a rising number of patients.[Photo/Agencies]

Haitian residents, who have been living and working undocumented in the Dominican Republic cross with their belongings into the Dominican Republic after waiting for four days for the border to be opened, in the Dominican town of Dajabon, Jan 10, 2013. About 1,000 undocumented Haitians, who returned to their home country for the year end holidays, were prevented from entering back into the Dominican Republic after the Dominican Army increased border control. The Dominican government finally opened the border around noon on the fourth day, allowing the Haitians with passports to apply for visas.[Photo/Agencies]