NEW : the Centers for Disease Control and Prevention 's official says agency working with Chinese to find source . Two people died of H7N9 virus on Wednesday in H7N9 , state-run news agency reports . All of the country 's Two cases were reported in eastern H7N9 . All but one of the five deaths have occurred in that city . H7N9 is a strain of Chinese flu not previously detected in humans .
NEW : the Centers for Disease Control and Prevention 's official says agency working with Chinese to find source . Two people died of H7N9 virus on Wednesday in H7N9 , state-run news agency reports . All of the country 's Two cases were reported in eastern H7N9 . H7N9 is a strain of Chinese flu not previously detected in humans .