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The mosquito-borne Zika virus — described in recent, grim federal warnings as "not controllable by current technologies"— could become an important source of hope for a regrouped Novavax Inc.

Gaithersburg-based Novavax (NASDAQ: NVAX), still recovering from stunning negative results from its phase 3 trials of its lead respiratory syncytial virus (RSV) vaccine for older adults, said this week that it had "exciting preclinical data" from its new Zika program.