Mathematical model has been increasingly applied in the description of the transmission of schistosomiasis, the prediction and selection of schistosomiasis prevention measures, and it has being developed constantly. This paper briefly introduces several typical mathematical models for transmission of schistosomiasis and summarizes their advancements.

Objective To investigate the clinical application of serum procalcitonin(PCT ) ,high sensitive C reactive protein(hs‐CRP)and interleukin‐6(IL‐6)in children with acute respiratory infections .Methods 136 cases of children with acute respiratory in‐fections were selected as observation group ,according to the results of the laboratory diagnosis ,which were divided into bacterial in‐fection group and viral infection group ,at the same time ,at the same period 83 cases of healthy children were selected as control group .Comparison of the level of PCT ,hs‐CRP and IL‐6 between groups .The level of PCT ,hs‐CRP and IL‐6 before and after treat‐ment was studied at the same time .The diagnostic value of PCT ,CRP ,IL‐6 was compared .Results The level of PCT ,hs‐CRP ,IL‐6 in bacterial infection group was significantly higher than the control group ,the difference was statistically significant(P<0 .05) . After treatment ,the level of PCT ,hs‐CRP ,IL‐6 was lower than that before treatment ,the difference was statistically significant (P<0 .05) .The sensitivity ,specificity ,the positive prediction rate ,negative prediction rate and Youden index of PCR was relatively higher compared with the other two index ,the difference was statistically significant(P<0 .05) .Joint detection of sensitivity had improved ,while the specific degree and Youden index was reduced .Conclusion The levels of PCT ,hs‐CRP ,IL‐6 in children with a‐cute respiratory infections have important clinical significance .PCT is better and more real as index for judgement for bacterial in‐fection .Joint detection and comprehensive evaluation of three indicators could significantly improve the sensitivity of the acute re‐spiratory infections ,which is helpful for early diagnosis and prognosis evaluation .