A Preliminary Study to Forecast Japanese Encephalitis Vector Abundance in Paddy Growing Area, with the Aid of Radar Satellite Images

Vector Borne and Zoonotic Diseases
K Hari Kishan RajuPurushothaman Jambulingam

Abstract

Vector mosquitoes of Japanese encephalitis (JE) breed mostly in rice fields, and human cases occur scattered over extended rural rice-growing areas. From this, one may surmise an ecological connection with the irrigation facilities and paddy cultivation. Furthermore, it has been hypothesized that a particular stage of paddy growth is a premonitory sign that can lead to a markedly increased population of the vector mosquitoes. The present study aimed to forecast the vector abundance by monitoring the paddy growth using remote sensing and geographical information systems. The abundance of the JE vector Culex tritaeniorhynchus peaked when the paddy crop was at its heading stage and dipped when the crop reached the maturing stage. A significant positive correlation was observed between paddy growth and adult density (r = 0.73, p < 0.008). The sigma naught values (σ0) derived from satellite images of paddy fields ranged from -18.3 (during transplantation stage) to approximately -10 (during the noncultivation period). A significant positive correlation was observed between σ0 and paddy growth stages (r = 0.87, p < 0.05) and adult vector density (r = 0.74, p = 0.04). The σ0 value observed during the vegetative and flowering stages of ...Continue Reading

References

Apr 5, 2000·Transactions of the Royal Society of Tropical Medicine and Hygiene·S W Lindsay, C J Thomas
Nov 7, 2000·Annals of Tropical Medicine and Parasitology·S SabesanE Michael
Jan 16, 2009·Proceedings of the National Academy of Sciences of the United States of America·Assaf AnyambaKenneth J Linthicum
Aug 27, 2010·Journal of Postgraduate Medicine·Khk RajuP Vanamail

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Citations

Mar 28, 2018·International Journal of Environmental Research and Public Health·Shaobai ZhangGuihua Zhuang
Jul 18, 2018·Vector Borne and Zoonotic Diseases·Hari Kishan RajuPurushothaman Jambulingam

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