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Year : 2022  |  Volume : 59  |  Issue : 1  |  Page : 79-85

Kyasanur forest disease and climatic attributes in India

1 Centre of Excellence for Climate Change and Vector borne Diseases, ICMR-National Institute of Malaria Research, New Delhi, India
2 Directorate of Health & FW Services, Ananda Rao Circle, Bangalore, Karnataka, India

Correspondence Address:
Ramesh C Dhiman
Environmental Epidemiology Division, ICMR–National Institute of Malaria Research, Sector-8, Dwarka, New Delhi 110077
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-9062.331408

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Background & objectives: In India, Kyasanur Forest Disease has been reported from the states of Karnataka, Kerala, Goa, and Maharashtra. The relationship between climatic factors and transmission of KFD remains untouched, therefore, the present study was undertaken. Methods: Based on the occurrence of cases, Shivamogga district (Karnataka) and Wayanad district in Kerala and northern Goa (Goa state) were selected for the study. Data on the incidence of KFD and climate factors were collected from concerned authorities. To determine the relationship between dependent and independent variables, spearman’s correlation was calculated for monthly as well as with lag months. Results: KFD cases and temperature (°C) were found significantly correlated up to 1 months’ lag period (p<0.05) while with precipitation relationship was found negatively significant for 0-3 months’ lag. The range of suitable temperature for KFD in Shivamogga, Goa and Wayanad was found as 20-31°C, 25-29°C and 27-31°C respectively. The cumulative precipitation during transmission months (November–May) ranged from <150-500mm, while in non-transmission months (June-October) from >1100-2400mm. Interpretation & conclusion: The analysis of three sites revealed that with the increase in temperature, the intensity of KFD transmission decreases as corroborated by the seasonal fluctuations in Shivamogga, Goa and Wayanad. High precipitation from June to October rovides suitable ecology to tick vector and sets in transmission season from November to May when cumulative precipitation is <500 mm.

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