In an era when too many people remain suspicious of vaccines, one of the world’s largest manufacturers may have made matters worse while trying to control dengue fever

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Although vaccines typically take years to produce, test, and license, US health officials had voiced confidence that Zika would not be a difficult target, and some predicted that a vaccine could be made and fully tested, ready for FDA assessment, within two to three years. Others predicted a licensed Zika vaccine could be available sometime in 2020

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Vaccine giant Sanofi Pasteur has quietly pulled the plug on its Zika vaccine project, a move that underscores how difficult it may be at this stage to develop a vaccine against the virus

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