Provided are a method for detecting respiratory infection associated with bacterial infection, a method for selecting patients with respiratory infection to receive an antibiotic, and a method for determining the timing for ending administration of an antibiotic to a patient with respiratory infection receiving the antibiotic, wherein said methods are characterized in that they are able to appropriately select patients with respiratory infection to whom the antibiotic is to be administered, to adjust the administration period of the antibiotic, and to treat respiratory infection associated with bacterial infection, and in which a measured value of sCD14-ST in blood is used as an indication.
