GIS information to attract up hazard assessment maps for dengue and chikungunya




Could the unusual Kyasanur Forest Sickness be spreading to the japanese sections of the nation? How does paddy cultivation affect the amount of Japanese Encephalitis circumstances? Could filariasis be identified in places previously mysterious? Scientists from the Vector Control Study Centre have been applying satellite knowledge to reply these concerns.

A team at the institute has been using satellite information on soil variety, rainfall, crop peak, forest density between other parameters to develop geographical, time-dependent and risk evaluation maps of quite a few vector-borne ailments this kind of as dengue and chikungunya. Their function not only aids in far better predicting outbreaks, it has changed the comprehending of where the disorder is identified.


A state-vast transmission danger map of lymphatic filariasis was developed by scientists from the institute applying geographic data procedure and environmental parameters this sort of as soil texture, altitude, temperature, rainfall and relative humidity. While a nationwide National Filaria Control Programme was started off in the nation as early on as 1955, there have been 190 districts that remained un-surveyed to see regardless of whether the ailment was endemic to these regions.

When the scientists utilized modelling to generate the risk map, they realised that the condition was endemic – leading to infection in a geographical area – in 113 of these districts. “To check out the results, we also carried out floor surveys in close to 90 places. We uncovered that the model was incredibly accurate. What we uncovered on floor matched the results of our map 92.8 for every cent. This displays the worth of such styles. It lowers the need for conducting surveys that are person-electricity intense,” explained Dr S Sabesan, adjunct professor at the institute.

He explained, “These 113 endemic districts were ultimately extra beneath the countrywide programme.” The nationwide filaria programme focuses on controlling the mosquito population and detection and treatment method of filarial carriers.

Filariasis is triggered by parasites transmitted by mosquitoes and blackflies. Despite the fact that most cases are asymptomatic, the most distinguishing symptom of the ailment is lymphatic filariasis, also regarded as elephantiasis – inflammation of the legs, arms, and genitals for the reason that of the hurt to the lymphatic program.


The scientists from the institute use spectral signatures – the wavelength of gentle reflected back to a satellite — from escalating paddy crops to predicting the danger for spread of Japanese Encephalitis, a viral infection transmitted by mosquitoes that brings about irritation in the mind.

“The most significant predictor for the spread of the infection is the mosquito inhabitants. The mosquitoes that distribute the infection are actually zoophilic, that means they choose biting animals. But when their populace explodes, there is a spill-around and some stop up biting individuals. Each stage of paddy growth has a distinct spectral signature, so we have been ready to affiliate the certain stage of growth with vector abundance. So, if all other elements like existence of host and weather conditions are conducive, we can notify when an outbreak could possibly occur,” explained Dr Sabesan.

India experiences any where among 1,000 and 2,000 instances of the infection each individual calendar year, with about 200 to 300 deaths, according to knowledge from the Countrywide Vector Borne Condition Handle Programme. Most of the bacterial infections are mild and lead to signs this kind of as fever, headache, and vomiting. It can also lead to altered mental standing and seizures in some.

The condition came to limelight when a lot more than 60 young children in UP’s Gorakhpur died at a hospital struggling with an oxygen disaster. By the way, it was the Puducherry institute that showed most of the fatalities were being truly caused by yet another mite-borne infection identified as scrub typhus.


Retaining its successes with threat-mapping of several conditions, the institute is now set to see no matter whether the exceptional an infection first detected in forests of Karnataka has been spreading north and even in jap states of the region. KFD is a haemorrhagic fever – a illness that sales opportunities to interior bleeding — prompted by a virus transmitted by ticks. Conditions of the an infection and deaths have been reported from the western states of Karnataka, Kerala, Tamil Nadu, Gujarat, and Maharashtra.

“The transform in land use designs and thinning forests are the most effective predictors of the prevalence of the an infection. Making use of GIS information we will do hazard mapping for the sickness to see regardless of whether it is growing in the direction of the north,” said Dr Sabesan. The model will consider to decide weather adjust and other factors which may lead to transmission of the infection in other pieces of the region.

Together with the mapping and on-floor verification of the findings, scientists from the institute are about to undertake a task to analyze no matter if the sickness-leading to tick carried the virus across India, which includes the eastern parts of the nation. The project also aims to see no matter if the individuals in these areas have been beforehand exposed to the an infection.

“This will be performed in mission method. Other than mapping, all the information that we gather will aid us in developing a system for eliminating the infection. Our researchers will perform on establishing diagnostics and vaccines from the an infection,” mentioned Dr Ashwani Kumar, director, VCRC.

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