Wed, Dec 04, 2019 - Page 4 News List

Mosquitoes carry dengue fever to Nepal’s mountains

The Guardian, KATHMANDU

Lilawati Awasthi is used to the risks that come from living in a remote mountainous district in the far west of Nepal. Floods, landslides and treacherous roads are a part of daily life.

However, this year she faced a new hazard: mosquitoes carrying a mystery illness.

When she began to feel sick in September she was not overly concerned at first.

“I thought it was a simple fever, but it wouldn’t go away,” said the 50-year-old. “We went to the hospital and it turned out I was suffering from dengue.”

Awasthi is one of more than 14,000 Nepalese who have been diagnosed with dengue fever since May, in an unprecedented outbreak that has left health professionals and the government reeling.

Some experts believe the actual number of infections to be closer to 140,000. Six people have died.

Dengue, a mosquito-borne viral infection with symptoms similar to severe flu, first appeared in Nepal in 2004. Minor outbreaks have occurred periodically, largely restricted to the country’s tropical southern plains and some urban areas.


This year’s outbreak has been remarkable both in its scale and reach. Dengue has been found in 67 of Nepal’s 77 districts, including those at higher elevations, a trend experts said is linked to the climate crisis.

“The role of climate change in poor countries where the health system is not robust is very big,” Nepal Health Research Council chief research officer Meghnath Dhimal said. “There has been a rapid geographical expansion of dengue, especially from the lowland to the highland.”

Almost 2,000 cases have been recorded in the Kathmandu Valley, which at 1,400m sits higher than the UK’s tallest peak, Ben Nevis.

A combination of factors are behind this year’s outbreak: prolonged and heavy monsoon rains and rising temperatures, alongside rapid urbanization and population movement.

Road expansion has created opportunities for the virus to move to higher altitudes, spread by infected people and mosquitoes carried in vehicles.

Once mosquitoes reach higher elevations where they would normally die, rising temperatures enable them to survive, Dhimal said.

“We have found that mosquitoes are now able to establish a population at up to 2,000 meters,” he said.

Awasthi is the first person to contract dengue in her village, her husband, Ram Dutta, said. “It really worries me that new diseases like dengue are becoming common. This area is getting hotter each year. There used to be very few mosquitoes before, but they are becoming common these days.”

The growth of dengue in Nepal follows a global trend that has seen the number of infections grow rapidly to an estimated 390 million a year, according to the WHO.

The UN body has said that about half the world’s population is now at risk.

At the Sukraraj Tropical and Infectious Disease hospital in Kathmandu, the director, Basu Dev Pandey, was worried about the future.

“It could be a disaster. During the peak of this year’s outbreak it was so difficult: 10,000 people came to the hospital. There was dengue-phobia,” he said.

Pandey said the number of recorded cases in Nepal this year is a “gross underestimate,” because the symptoms of dengue are similar to a typical fever.

“Many people just visit the local pharmacy for treatment, and in Kathmandu the majority of patients go to private hospitals, whose data is not included in the government’s statistics,” he said.

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