Document Type: Original Article


1 Geographic Sciences and Planning Faculty, University of Isfahan, Iran

2 Department of Geology, Science Faculty, University of Isfahan, Isfahan, Iran

3 Social Determinants of Health Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran


Background and aims: Shigellosis or bacillary dysentery is an infectious disease transmitted through water and food. It is a type of infectious colitis caused by Shigella bacteria. The aim of this study is to determine the prevalence and the spatial distribution of shigellosis and its relationship with climatic factors in Chaharmahal and Bakhtiari province. Methods: In this study, population of infected people to shigellosis in the province during 2011 to 2014 obtained from reliable sources and analyzed. The statistics were standardized for every city in the event of illness per hundred thousand people. The relationships between incidence of the disease and the climatic factors (temperature, rainfall and humidity) were investigated by Pearson correlation coefficient after generation of zonation map using GIS and analysis of the concentration centers. Results: According to the results, Koohrang, Lordegan and Ardal cities are classified as high risk areas with an incidence more than 400000 people. Borujen and Faarsan cities are medium risk areas with an incidence less than 250 per 100000, and Shahr-e-kord city with an incidence less than 100 per 100000 people is considered a low risk area. The incidence grows with increase in the temperature. Increase in the precipitation and humidity decreases incidence of the disease. Concentration and prevalence of shigellosis mostly occur in west of the province, because this area is located in the neighborhood of Khuzestan province, and also due to nomadic residence of Bakhtiari nomads in this part during summer and their unhealthy lifestyle, limited access to treated water and especially consumption of untreated surface water. The higher concentration of nomadic residence and higher contamination of water increase incidence of waterborne diseases. The frequency increase of the disease in warm seasons can be due to prevalence of Shigella dysentery in the region. Conclusion: Based on the results, significant positive correlations exist between the surface water consumption, the temperature increase, the number of pisciculture centers in the area and incidence of the disease. Significant negative correlations are also observed between the rainfall, humidity and incidence of the disease.


Main Subjects

1. Shariatpanahi M. Principles of Environmental Health. 3rd ed. Tehran: University of Tehran Press; 2003:429. [Persian].

2. Zamani A, Rahbarimanesh AA, Raeeskarami SR, Dejakam A. Clinical and Paraclinical Findings in Shigelosis. Iran J Pediatr. 2007;17( 2):243-8.

3. Hoffmann C, Sahly H, Jessen A, Ingiliz P, Stellbrink HJ, Neifer S, et al. High rates of quinolone-resistant strains of Shigella sonnei in HIV-infected MSM. Infection. 2013;41(5):999-1003. doi: 10.1007/s15010-013-0501-4.

4. Asmarian NS, Kavousi A, Salehi M, Mahaki B. Mapping of Stomach cancer rate in Iran using area-to-area Poisson Kriging. Journal of Health System Research. 2012;8(4):681-7.

5. Khoshdel AR, NooriFard M, Pezeshkan R, Salahi Moghaddam A. Mapping the important communicable diseases of Iran. Journal of Health and Development. 2012;1(1):31-46

6. Rezaeian M. Use of geographical information systems in epidemiology. The Journal of Qazvin University of Medical Sciences & Health Services. 2006;10(38):115-23. [Persian].

7. Safe A, Rashidi M, Rouzbahani R, Dehdashti NS, Poursafa P. Application of GIS in strategic medical research for disease prevention. Journal of Isfahan Medical School. 2012;29(164): 1-7. [Persian].

8. Pepper I, Gerba C, Gentry T. Environmental Microbiology. 3rd ed. San Diego: Academic Press; 2014:728.

9. Salvato JA. Environmental Engineering and Sanitation. 4th ed. New York: John Wiley & Sons; 2003:1584.

10. Mesdaghinia A, Nabizadeh R. Fundamentals of environmental health science. 3rd ed. Tehran: Ministry of health and medical science education publication (Deputy of research and technology); 2011:249-79. [Persian].

11. Snow J. On the Mode of Communication of Cholera. 2nd ed. London: John Churchill; 1855:162.

12. Clarke KC, Osleeb JP, Sherry JM, Meert JP, Larsson RW. The use of remote sensing and geographic information systems in UNICEF’s dracunculiasis (Guinea worm) eradication effort. Prev Vet Med. 1991;11:229-35.

13. Navarra A, Tubiana L, eds. Regional Assessment of Climate Change in the Mediterranean, Advances in Global Change Research. Dordrecht: Springer; 2013:162.

14. Hooshvar Z. An Introduction to medical geography of Iran. Tehran: University Jihad Pub; 1986:216. [Persian].

15. Raeisi R, Baiati A, Karami J, Sarkaregar-Ardakani A, Katorani S, Ramezannezhad P, et al. Spatial distribution of multiple sclerosis disease in Chaharmahal va Bakhtiari province in 20- year period. J Shahrekord Univ Med Sci. 2013;15(4):73-82. [Persian].

16. Statistical Center of Iran website.

17. Chaharmahal and Bakhtiari Meteorological Administration. Chaharmahal and Bakhtiary Daily Meteorological Data. http:// Updated January 10, 2016.

18. Meade M, Emch M. Medical Geography. 3rd ed. New York: Guilford Press; 2010:497.

19. Jamalian R. Epidemiology and prevention from prevalent infectious diseases in Iran. Tehran: Ettelaat Press; 1990:191. [Persian].

20. WHO Expert Committee on Biological Standardization (Fifty-eighth report). WHO Technical Report Series, No. 963. Geneva: WHO; 2007:244.