Objective To prepare freeze-drying control materials of IgG antibody against Schistosoma japonicum for detec-tion kits. Methods The serum samples of schistosomiasis patients from endemic areas and normal people without history of schistosome infection or contact with infested water in Hubei Province were collected.All the sera were detected by the method approved by China Food and Drug Administration and selected for preparation of quality control samples. Results Totally twelve positive quality control materials,ten negative quality control materials,and one sensitive and one precision quality con-trol materials were screened.According to the positive serum level,the positive degrees of quality control materials were divided into strong,medium and weak levels.The stability could be valid for one year.Conclusions The freeze-drying quality control materials of IgG antibody against S.japonicum for detection kits are prepared.They are easy to use and have good stability,and therefore,they may meet the requirement of quality control for the detection of schistosomiasis diagnostics kits.

To investigate the space-time patterns of schistosomiasis after the stage of transmission controlled in Hubei Province, so as to provide the reference for precise controlling.The data of human schistosomiasis cases in Hubei Province from 2015 to 2016 and basic information of human schistosomiasis cases and serum antibody titer of human schistosomiasis cases in 2016 were collected and analyzed. The spatial clustering of human schistosomiasis was detected by the Flexible spatial scan statistics and Kulldorff circular scan statistic, respectively.Totally 64 819 serological positive cases from 51 counties and 1 504 stool hatching positive cases from 17 endemic counties were reported in Hubei Province in 2015, and 39 365 serological positive cases were reported from 48 counties in 2016. All of them were identified as the research objects. No stool hatching positive cases were reported from the routine work in the whole province in 2016. There were 1 603 cases of the highest antibody titer (1∶80 or more), with the proportion of 4.07%. According to the results of Kulldorff spatial clustering analysis, there were eight and six spatial clustering areas in the distribution of serological positive cases and stool hatching positive cases in 2015, respectively. The numbers of spatial clustering areas in the distribution of serological positive cases and the cases of the highest antibody titer (1∶80 or more) were eight and five in 2016, respectively. According to the results of Flexible spatial clustering analysis, there were three and two spatial clustering areas in the distribution of serological positive cases and stool hatching positive cases in 2015, respectively. The numbers of spatial clustering areas in the distribution of serological positive cases and the cases of highest antibody titer (1∶80 or more) were two and one in 2016, respectively.The distribution of human schistosomiasis cases is not balanced, and there is spatial clustering in Hubei Province. So the key area for prevention and control is on the middle and lower reaches of the Yangtze River in the future.