Objective  To analyze prevalence characteristics of pertussis in Zaozhuang city of Shandong province during 2013 – 2018 and to provide evidences for effective prevention and control of pertussis.

  Methods  Information on all pertussis cases reported in Zaozhuang city during 2013 – 2018 were extracted from the National Infectious Disease Report Information Management System and analyzed with descriptive statistics and circular distribution. Excel 2013 and SPSS 21.0 were adopted in data processing. ArcGis 10.6 was used to perform visual display.

  Results  A total of 507 pertussis cases were reported during the 6-year period in the city and the average annual incidence was 2.07/100 000. The annual pertussis incidence in 2018 was 2.83 times higher than that in 2017. Circular distribution analysis revealed an incidence peak during 17 – 18 of July in a year and a high incidence season from July to September in a year. The most (476, 93.52%) of the reported pertussis cases were scattered children and more than a half (294, 57.76%) of the cases were children less than one year old. The highest prefecture-specific average annual incidence rate was 2.89/100 000 and the highest town-specific average annual incidence rate was 7.83/100 000.

  Conclusion  During 2013 – 2018 in Zaozhuang city, the incidence of pertussis increased obviously and the incidence peak was in summer season. Timely and supplementary vaccination should be promoted among children less than one year old and scattered children for pertussis prevention.