Lack of preparedness in our fight against this vector-borne disease is much to blame for it spreading fast
Incidence of dengue higher due to erratic rainfall this year
The high number of dengue cases in many states around the country has grabbed headlines as the national tally of cases this year is nearly twice the number recorded during the same period last year.
While the burden of this disease is higher in southern states, the outbreak in Delhi is being seen as the result of poor preparedness on part of the administration. The rapid progression of the disease has taken many by surprise as the high incidence is unseasonal compared to earlier trends. The dengue virus usually strikes the city only after the end of the monsoons in October.
The reason for the temporal shift, say experts, is the erratic weather and rainfall that the country has witnessed this year. Many scientific studies in the recent past have drawn connections between weather variables and the incidence of dengue. Many scientists are in agreement that a combination of higher mean temperature in a region and high humidity fosters higher rates of dengue transmission and incidence.
A C Dhariwal, director of National Vector Borne Disease Control Programme (NVBDCP), agrees with the correlation cited in the studies but adds that the prime reason for the unseasonal susceptibility of the country to multiple dengue outbreaks this year has been the unusual monsoon. The monsoon season was characterised by intense wet spells followed by long dry spells.
"Usually when it rains, the rainwater flushes away stagnant pools that act as sites for mosquito breeding. This year, we saw rainfall early in the season which was followed by long dry spells during which there has been high humidity, especially in Delhi. This has enabled a shift from the usual trend of dengue transmission that we have observed and the virus has struck parts of the country earlier than usual," he says.
We are a voice to you; you have been a support to us. Together we build journalism that is independent, credible and fearless. You can further help us by making a donation. This will mean a lot for our ability to bring you news, perspectives and analysis from the ground so that we can make change together.
India Environment Portal Resources :
Comments are moderated and will be published only after the site moderator’s approval. Please use a genuine email ID and provide your name. Selected comments may also be used in the ‘Letters’ section of the Down To Earth print edition.