E-ISSN 2277-338X | ISSN 2320-4664
 

Original Research 


Spatial distribution of dengue fever incidence in Kerala state – A retrospective study

Mudavath Siva Durga Prasad Nayak, K A Narayan.

Abstract
Background: Dengue fever is a rapidly spreading viral infection. The incidence of dengue fever cases in Kerala is still rising from the year 2006 onward in spite of several measures. The pattern of dengue fever distribution is not uniform in all the districts. Only some districts are reporting a high number of cases in every year. Based on this background, the present study conducted to observe and analyze the spatial distribution pattern of dengue fever incidence in Kerala state.

Objectives: The objectives of the present study are to assess the spatial auto-correlation of dengue fever incidence in Kerala state and to identify the significant spatial clusters having a high or low incidence of dengue fever in Kerala state.

Materials and Methods: The present study is a retrospective observational study using the secondary data of Kerala state. Year wise incidence of dengue fever cases in each district was measured. Since 2011, hierarchical maps of the incidence of dengue fever in different districts were created using QGIS software. Spatial auto-correlation of dengue fever incidence in every year was tested using GeoDa software. Global Moran’s i value was measured in each year, local indicators of spatial association maps prepared to observe the spatial distribution of dengue fever incidence in Kerala.

Results: Incidence of dengue fever cases is in increasing trend in every district, but in the year 2014 and 2018, the incidence was decreased compared to the previous year. Among all the years, 2013, 2016, and 2017 showed significant positive global spatial auto-correlation. Kollam district is showed a high-high spatial pattern. Low-low cluster areas were observed in North Kerala from 2011 to 2013 and in central Kerala in the years 2016 and 2018.

Conclusion: Spatial distribution of dengue fever incidence is not uniform every year. Kollam district significantly reporting the high incidence and surrounded by high incidence districts. Kannur, Malappuram, Palakkad, Wayanad, Thrissur, and Ernakulam districts significantly reporting the low incidence of dengue fever and they were surrounded by low incidence districts. This type of analysis helps identify areas where control efforts can be intensified strategically thus optimizing resources Larger studies can be conducted at subnation or nation level, to eliminate the border issues between states and for better identification of local spatial clusters of dengue fever incidence.

Key words: Dengue fever; Global Moran’s I; Hierarchical Maps; Local Indicators of Spatial Association Maps; Spatial Analysis


 
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How to Cite this Article
Pubmed Style

Nayak MSDP, Narayan KA. Spatial distribution of dengue fever incidence in Kerala state – A retrospective study. Int J Med Sci Public Health. 2019; 8(6): 430-439. doi:10.5455/ijmsph.2019.0408515042019


Web Style

Nayak MSDP, Narayan KA. Spatial distribution of dengue fever incidence in Kerala state – A retrospective study. http://www.ijmsph.com/?mno=41943 [Access: June 24, 2019]. doi:10.5455/ijmsph.2019.0408515042019


AMA (American Medical Association) Style

Nayak MSDP, Narayan KA. Spatial distribution of dengue fever incidence in Kerala state – A retrospective study. Int J Med Sci Public Health. 2019; 8(6): 430-439. doi:10.5455/ijmsph.2019.0408515042019



Vancouver/ICMJE Style

Nayak MSDP, Narayan KA. Spatial distribution of dengue fever incidence in Kerala state – A retrospective study. Int J Med Sci Public Health. (2019), [cited June 24, 2019]; 8(6): 430-439. doi:10.5455/ijmsph.2019.0408515042019



Harvard Style

Nayak, M. S. D. P. & Narayan, . K. A. (2019) Spatial distribution of dengue fever incidence in Kerala state – A retrospective study. Int J Med Sci Public Health, 8 (6), 430-439. doi:10.5455/ijmsph.2019.0408515042019



Turabian Style

Nayak, Mudavath Siva Durga Prasad, and K A Narayan. 2019. Spatial distribution of dengue fever incidence in Kerala state – A retrospective study. International Journal of Medical Science and Public Health, 8 (6), 430-439. doi:10.5455/ijmsph.2019.0408515042019



Chicago Style

Nayak, Mudavath Siva Durga Prasad, and K A Narayan. "Spatial distribution of dengue fever incidence in Kerala state – A retrospective study." International Journal of Medical Science and Public Health 8 (2019), 430-439. doi:10.5455/ijmsph.2019.0408515042019



MLA (The Modern Language Association) Style

Nayak, Mudavath Siva Durga Prasad, and K A Narayan. "Spatial distribution of dengue fever incidence in Kerala state – A retrospective study." International Journal of Medical Science and Public Health 8.6 (2019), 430-439. Print. doi:10.5455/ijmsph.2019.0408515042019



APA (American Psychological Association) Style

Nayak, M. S. D. P. & Narayan, . K. A. (2019) Spatial distribution of dengue fever incidence in Kerala state – A retrospective study. International Journal of Medical Science and Public Health, 8 (6), 430-439. doi:10.5455/ijmsph.2019.0408515042019





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