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Alarm Thresholds for Pertussis Outbreaks in Iran: National Data Analysis

Osong Public Health and Research Perspectives 2020년 11권 5호 p.309 ~ 318
Alimohamadi Yousef, Zahraei Seyed Mohsen, Karami Manoochehr, Yaseri Mehdi, Lotfizad Mojtaba, Holakouie-Naieni Kourosh,
소속 상세정보
 ( Alimohamadi Yousef ) - Tehran University of Medical Sciences School of Public Health Department of Epidemiology and Biostatistics
 ( Zahraei Seyed Mohsen ) - Ministry of Health and Medical Education Center for Communicable Diseases Control
 ( Karami Manoochehr ) - Hamadan University of Medical Sciences Research Center for Health Sciences
 ( Yaseri Mehdi ) - Tehran University of Medical Sciences School of Public Health Department of Epidemiology and Biostatistics
 ( Lotfizad Mojtaba ) - Tarbiat Modares University School of Electrical and Computer Engineering
 ( Holakouie-Naieni Kourosh ) - Tehran University of Medical Sciences School of Public Health Department of Epidemiology and Biostatistics

Abstract


Objectives: 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.

Methods: Data on suspected cases of pertussis from the 25th February 2012 to the 23rd 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.

Results: 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.

Conclusion: 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.

키워드

disease outbreak; epidemic; pertussis; seasons

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