Researchers have come up with a vaccine that is effective against the four strains of the deadly disease that has proven effective on trials using monkeys. Annually, there are a reported million cases of infection that comes mostly from the tropics and people who have been to such areas. Two of the four types are deadly, hemorrhagic fever and dengue shock syndrome the tetravalent vaccine hopes to address. Proteins from all four viral strains were combined along with an adenovirus agent that resulted in the vaccine that promises to be the best yet.
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