Spatiotemporal analysis of brucellosis incidence in Iran from 2011 to 2014 using GIS

•During the years of study, 68,493 cases of brucellosis were reported.•The average incidence rate of brucellosis during this period was 38.67/100,000.•The highest incidence rate of brucellosis in 2011 was observed in Koohrang County, with 317/100,000.•Hot-spot analysis showed the incidence rates of...

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Published in:International journal of infectious diseases 2018-02, Vol.67 (C), p.129-136
Main Authors: Pakzad, Reza, Pakzad, Iraj, Safiri, Saeid, Shirzadi, Mohammad Reza, Mohammadpour, Marzieh, Behroozi, Abbas, Sullman, Mark J.M., Janati, Ali
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Language:English
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Brucellosis
Cluster pattern
GIS
Hot-spots
Spatiotemporal modeling
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creator Pakzad, Reza
Pakzad, Iraj
Safiri, Saeid
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Janati, Ali
description •During the years of study, 68,493 cases of brucellosis were reported.•The average incidence rate of brucellosis during this period was 38.67/100,000.•The highest incidence rate of brucellosis in 2011 was observed in Koohrang County, with 317/100,000.•Hot-spot analysis showed the incidence rates of the disease were highest around the mountainous areas of Iran. To investigate the distribution and trends associated with brucellosis incidence rates in Iran from 2011 to 2014. The reported incidence rates of brucellosis for the years 2011–2014 were collected and entered into GIS 10.1. The Cochran–Armitage test for linear trends, choropleth maps, hot-spot analysis, and high–low clustering analysis were used to investigate patterns of the disease over the study period and by season, and to identify high-risk areas and any clustering of the disease. The significance level was set at p
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To investigate the distribution and trends associated with brucellosis incidence rates in Iran from 2011 to 2014. The reported incidence rates of brucellosis for the years 2011–2014 were collected and entered into GIS 10.1. The Cochran–Armitage test for linear trends, choropleth maps, hot-spot analysis, and high–low clustering analysis were used to investigate patterns of the disease over the study period and by season, and to identify high-risk areas and any clustering of the disease. The significance level was set at p&lt;0.05. A total of 68493 cases of brucellosis were reported during the study period, giving an average brucellosis incidence rate for this period of 38.67/100000. In 2011, the highest rate of brucellosis was observed in Koohrang County of Chaharmahal-Bakhtiari Province, with 317/100 000. In the subsequent years, 2012–2014, Charuymaq County of East-Azerbaijan Province had incidence rates of 384, 534, and 583/100000, respectively. However, the incidence rate of the disease did not follow a linear trend (p&lt;0.001). The maximum and minimum incidence rates of the disease occurred in mid-summer and mid-winter, respectively. The results of the hot-spot analysis showed that the distribution of the disease was highest in the mountainous areas of Iran, particularly along the Zagros mountain range and in most cities near the Zagros Mountains (p&lt;0.01). In addition, the cluster analysis showed a clustering pattern in these high incidence areas (p&lt;0.01). There were significant differences in the geographic distribution of brucellosis, with the incidence rates being highest in most of the cities in the west and north-west of the country. The incidence of this disease also increased during the summer. 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To investigate the distribution and trends associated with brucellosis incidence rates in Iran from 2011 to 2014. The reported incidence rates of brucellosis for the years 2011–2014 were collected and entered into GIS 10.1. The Cochran–Armitage test for linear trends, choropleth maps, hot-spot analysis, and high–low clustering analysis were used to investigate patterns of the disease over the study period and by season, and to identify high-risk areas and any clustering of the disease. The significance level was set at p&lt;0.05. A total of 68493 cases of brucellosis were reported during the study period, giving an average brucellosis incidence rate for this period of 38.67/100000. In 2011, the highest rate of brucellosis was observed in Koohrang County of Chaharmahal-Bakhtiari Province, with 317/100 000. In the subsequent years, 2012–2014, Charuymaq County of East-Azerbaijan Province had incidence rates of 384, 534, and 583/100000, respectively. However, the incidence rate of the disease did not follow a linear trend (p&lt;0.001). The maximum and minimum incidence rates of the disease occurred in mid-summer and mid-winter, respectively. The results of the hot-spot analysis showed that the distribution of the disease was highest in the mountainous areas of Iran, particularly along the Zagros mountain range and in most cities near the Zagros Mountains (p&lt;0.01). In addition, the cluster analysis showed a clustering pattern in these high incidence areas (p&lt;0.01). There were significant differences in the geographic distribution of brucellosis, with the incidence rates being highest in most of the cities in the west and north-west of the country. The incidence of this disease also increased during the summer. 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To investigate the distribution and trends associated with brucellosis incidence rates in Iran from 2011 to 2014. The reported incidence rates of brucellosis for the years 2011–2014 were collected and entered into GIS 10.1. The Cochran–Armitage test for linear trends, choropleth maps, hot-spot analysis, and high–low clustering analysis were used to investigate patterns of the disease over the study period and by season, and to identify high-risk areas and any clustering of the disease. The significance level was set at p&lt;0.05. A total of 68493 cases of brucellosis were reported during the study period, giving an average brucellosis incidence rate for this period of 38.67/100000. In 2011, the highest rate of brucellosis was observed in Koohrang County of Chaharmahal-Bakhtiari Province, with 317/100 000. In the subsequent years, 2012–2014, Charuymaq County of East-Azerbaijan Province had incidence rates of 384, 534, and 583/100000, respectively. 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subjects Brucellosis
Cluster pattern
GIS
Hot-spots
Spatiotemporal modeling
title Spatiotemporal analysis of brucellosis incidence in Iran from 2011 to 2014 using GIS
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