Via BBC :
" New clues into how the body fights off the tropical disease dengue fever could help in the search for a vaccine.
The research, published in Science, also explains why those who recover from the virus have much worse symptoms if they catch it again.
Dengue fever is a viral infection spread by a mosquito bite. It is a major cause of illness worldwide, and cases are on the rise.
There is currently no licensed vaccine or drug treatment.
The researchers, based in the UK and Thailand, took blood samples from infected volunteers.
They found antibodies produced in response to the virus do not do a very effective job.
Rather than neutralising the virus, they actually help it infect more cells, springing into action when a person is infected a second time by a different strain of the virus."
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