Background: Tuberculosis (TB) spread pattern is influenced by geographic and social factors. Nowadays Geographic
Information System (GIS) is one of the most important epidemiological instrumentation identifying high-risk population
groups and geographic areas of TB. The aim of this study was to determine the correlation between climate and
geographic distribution of TB in Khuzestan Province using GIS during 2005-2012.
Methods: Through an ecological study, all 6363 patients with definite diagnosis of TB from 2005 until the end of September
2012 in Khuzestan Province, southern Iran were diagnosed. Data were recorded using TB- Register software.
Tuberculosis incidence based on the climate and the average of annual rain was evaluated using GIS. Data were analyzed
through SPSS software. Independent t-test, ANOVA, Linear regression, Pearson and Eta correlation coefficient
with a significance level of less than 5% were used for the statistical analysis.
Results: The TB incidence was different in various geographic conditions. The highest mean of TB cumulative incidence
rate was observed in extra dry areas (P= 0.017). There was a significant inverse correlation between annual rain
rate and TB incidence rate (R= -0.45, P= 0.001). The lowest TB incidence rate (0-100 cases per 100,000) was in areas
with the average of annual rain more than 1000 mm (P= 0.003).
Conclusion: The risk of TB has a strong relationship with climate and the average of annual rain, so that the risk of
TB in areas with low annual rainfall and extra dry climate is more than other regions. Services and special cares to
high-risk regions of TB are recommended.