At least 211 people, mostly children, have died in an outbreak of Japanese encephalitis in an impoverished region of northern Indian and the death toll is likely to soar, officials said Saturday.
Eastern parts of India's most populous state are ravaged by encephalitis each year as malnourished children succumb to the virus which is transmitted by mosquitoes from pigs to humans but this is one of the worst outbreaks, officials said.
"Most of the deaths have occurred in the Gorakhpur district of Uttar Pradesh state since the monsoon struck the region in July," regional health officer U.K. Srivastava told AFP by telephone from Gorakhpur.
"A total of 1,299 patients had been admitted in hospitals until Friday in Gorakhpur," which is the epicentre of the outbreak, and "more encephalitis patients are coming into our hospitals," Srivastava told AFP.
"We fear the total number of encephalitis cases will go up to at least 3,500 and the death rate will be at a ratio of around 20 percent," Srivastava said.
Japanese encephalitis causes brain inflammation and can result in brain damage. Symptoms include headaches, seizures and fever.
Health experts say 70 million children nationwide are at risk of encephalitis.
Unusually heavy monsoon rains coupled with overflowing rivers coursing through Gorakhpur are making it tougher for health workers battling encephalitis.
"We have begun spraying insecticides to wipe out populations of the culex mosquitos which transmits the disease and we are handing out chlorine to villagers to disinfect their drinking water supplies," Srivastava said.
V.S. Nigam, in charge of Uttar Pradesh's encephalitis prevention programme, said a mammoth project to contain the disease ended with 35 million children vaccinated in the state's 34 districts.
But as soon children are vaccinated against Japanese encephalitis, they fall sick with acute encephalitis syndrome "because when one virus is suppressed by vaccines, others become dominant," he said from the state capital Lucknow.
"It's a large challenge," Nigam said, adding state health experts would meet national virologists next week in New Delhi for talks on way to prevent future outbreaks.
The regional chapter of the Voluntary Health Association, India's largest non-governmental organisation, which works alongside the UN Children's Fund, blamed the annual tragedy on the state's random immunisation programmes.
"A high alert is sounded only after an encephalitis epidemic flares," association executive director J.P. Sharma said.
"Preventive steps should be taken well ahead of the monsoon as vaccines need an incubation period to make human beings immune to the virus," Sharma told AFP.