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WHO Says Indian Company, NIH Have Lead In Zika Vaccine Work

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India’s Bharat Biotech International Ltd. and the U.S. National Institutes for Health appear to be the most advanced in developing possible vaccines for Zika, the World Health Organization said, although it will take at least 18 months for any shots against the virus to be ready for clinical trials.

Closely held Bharat Biotech, which has done research on other mosquito-borne viruses, earlier this month said it has two potential Zika vaccine candidates under development. While several companies are working on Zika vaccines, the current absence of standardized animal models and reagents is slowing down development, the WHO said in a statement Friday.