India has 6 million unreported dengue cases: Study

Washington: India has nearly 6 million more dengue cases than the official annual tally and costs the nation $1.11 billion, roughly the same India spends on its national space programme, according to a new study.

American and Indian researchers have calculated that the number of those suffering from the mosquito-borne disease is about 282 times higher than officially reported, according to the study published online Tuesday in the American Journal of Tropical Medicine and Hygiene.

Until now, the reported data indicated that there was an annual average of 20,000 laboratory confirmed cases.

The study for the first time used systematic empirical data to arrive at its striking estimates for both the disease burden and the direct and indirect costs of dengue in India, according to a media release.

The study was led by researchers at Brandeis University's Schneider Institute for Health Policy in Waltham, Massachusetts, the INCLEN Trust International in New Delhi, and the Indian Council of Medical Research's Centre for Research in Medical Entomology (CRME) in Madurai, Tamil Nadu.

"We found that India had nearly 6 million annual clinically diagnosed dengue cases between 2006 and 2012," said Donald Shepard, lead author of the study and a health economics professor at Brandeis University.

"Yet we believe even that number may be low because dengue reporting is better in the area we studied in the state of Tamil Nadu than in most other Indian states due to its well-established medical surveillance system."

"Good data on the incidence and cost of the illness have been lacking due to gaps in how information on individual cases is collected and reported," said Narendra Arora, executive director of INCLEN.

"Understanding the full extent of the economic and disease burden of dengue in India is necessary to help policymakers and public health officials prepare for and control future outbreaks of the disease," said Brij Kishore Tyagi, senior investigator from CRME.

India is believed to have more cases of dengue than any other country in the world, and except for a slight dip in 2011, the incidence rate has grown steadily there in recent years, the study said.

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