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<b>Objectives</b>
<p>The purpose of the current study was to determine the upper threshold number of cases for which pertussis infection would reach an outbreak level nationally in Iran.</p></sec>
<sec>
<b>Methods</b>
<p>Data on suspected cases of pertussis from the 25<sup>th</sup> February 2012 to the 23<sup>rd</sup> March 2018 from the Center for Disease Control and Prevention in Iran was used. The national upper threshold level was estimated using the exponentially weighted moving average (EWMA) method and the Poisson regression method.</p></sec>
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<b>Results</b>
<p>In total, 2,577 (33.6%) and 1,714 (22.3%) cases were reported in the Spring and Summer respectively. There were 1,417 (18.5%) and 1,971 (25.6%) cases reported in the Autumn and Winter, respectively. The overall upper threshold using the EWMA and the Poisson regression methods, was estimated as a daily occurrence of 8 (7.55) and 7.50 (4.48–11.06) suspected cases per 10,000,000 people, respectively. The daily seasonal thresholds estimated by the EWMA and the Poisson regression methods were 10, 7, 6, 8 cases and 10, 7, 7, 9 cases for the Spring, Summer, Autumn, and Winter, respectively.</p></sec>
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<b>Conclusion</b>
<p>The overall and seasonal estimated thresholds by the 2 methods were similar. Therefore, the estimated thresholds of 6–10 cases in a day, per 10,000,000 people could be used to detect pertussis outbreaks and epidemics by health policymakers.</p></sec>
Citations
Citations to this article as recorded by
Burden of pertussis in infants in the Eastern Mediterranean Region and the impact of maternal vaccination: a systematic review Randa K. Saad, Yousef Khader, Flor M. Munoz, Faris Lami, Ezzeddine Mohsni, Nadine Haddad BMC Public Health.2025;[Epub] CrossRef
Immunogenicity and Safety of a Newly Developed Tetanus-Diphtheria Toxoid (Td) in Healthy Korean Adolescents: a Multi-center, Randomized, Double-blind, Active-Controlled Phase 3 Trial Ui Yoon Choi, Ki Hwan Kim, Jin Lee, Byung Wook Eun, Hwang Min Kim, Kyung-Yil Lee, Dong Ho Kim, Sang Hyuk Ma, Jina Lee, Jong-Hyun Kim Journal of Korean Medical Science.2021;[Epub] CrossRef