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Japanese Encephalitis Vaccine Clears Safety Tests

November 30, 2007 at 6:16 PM Drug News
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A prototype vaccine against Japanese encephalitis, a viral disease endemic in Southeast Asia and parts of South Asia, is safe and triggers a good immune response against the pathogen, a study to be published on Saturday says.
Japanese Encephalitis Vaccine Clears Safety Tests


Transmitted through mosquito bites, Japanese encephalitis can cause fever, blinding headaches, neck stiffness and convulsions and in a fifth of cases is fatal.

The test vaccine, made by a Scottish subsidiary of Intercell AG, an Austrian-headquartered company, was tested on 867 adults in the United States, Britain and Austria.

Response from antibodies -- the frontline troops in the body's immune system -- was twice that for a existing vaccine against the disease and side effects "were generally mild," according to the study, which appears in The Lancet.

Around 50,000 cases of Japanese encephalitis occur each year, mainly in children under 10, according to the US Centers for Disease Control (CDC).

An outbreak in northern India this year claimed more than 300 lives. The natural reservoir for the virus is pigs and wild birds.

The disease has been mainly fought using a vaccine that is derived from the brains of mice that have been infected with the virus. The virus is then killed -- "inactivated" -- using chemicals before it is introduced into the body.

The problem, though, is that this vaccine is expensive, difficult to produce, needs three doses and has been associated with bad but rare, allergic responses.

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