Generally speaking, examination is needed after 2~3 days of antibiotic treatment, but it is also necessary to arrange the examination time and items according to the specific conditions of the patient. Usually, the effectiveness of antibiotic treatment needs to be observed for 48~72 hours, that is to say, after 2~3 days of antibiotic application, blood routine, C-reactive protein, procalcitonin and other related inflammatory indexes should be re-checked to assess the efficacy of antibiotics. However, when to check after the application of antibiotics and the items to be checked should be combined with the specific condition, for example, if the condition progresses rapidly after the application of antibiotics, even less than two days need to be timely rechecked to observe the change of the condition. In addition, sometimes 1~2 weeks after antibiotic treatment may also need to do imaging tests to further assess the condition, to determine whether the recovery, or whether the treatment program needs to be adjusted.