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Researchers successfully test vaccine for Malaria

U.S. researchers say they've successfully tested a vaccine for Malaria.
The mosquito-borne tropical disease kills about 1 million people a year and sickens more than 200 million.
The vaccine involves multiple, intravenous injections of a weakened form of the disease.

It  was tested on a small group of volunteers.
Researchers from Vanderbilt University say though the results were promising, more extensive field testing will be required.
It may be eight to 10 years before the vaccine can be scientifically proven, approved and distributed.
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