OBJECTIVE To investigate the changes of trace elements and nutritional state-related indexes of acute leukemia children complicated with respiratory tract infections so as to provide guidance for control of the respiratory tract infections in the acute leukemia children.METHODS A total of 42 acute leukemia children complicated with respiratory tract infections who were treated from Jan 2014 to Nov 2015 were chosen as the group A,meanwhile,42 acute leukemia children without respiratory tract infections were ...