AN American expert on tropical diseases testified before the Senate on Tuesday that he warned anti-dengue vaccine maker Sanofi on the health risks of using the Dengvaxia vaccine in 2016, bolstering the government’s case against the French pharmaceutical giant and health officials of the Aquino administration.

Scott Halstead told the Senate Blue Ribbon Committee he even sent a video of Antonio Dans, a health expert, hoping that it could be presented during a Blue Ribbon hearing that same year.

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