A year and a half later, Sanofi announced that it had new information about the vaccine’s safety. Confirming Dr. Halstead’s fears, the company made the alarming admission that Dengvaxia did indeed increase the risk of hospitalization and cytoplasmic leakage syndrome.127 By this time, health officials had already inoculated some 800,000 Filipino children. At least 600 had died.128 The WHO eventually changed its recommendation, saying that Dengvaxia was safe only for kids who’d had a prior dengue infection and admitting that 100,000 should not have received the shot. Following autopsies on 600
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