WASHINGTON, United States (AFP) — US biotech firm Novavax’s Covid-19 vaccine was shown to be 100 percent protective against severe cases of the disease, including hospitalization and death, the company said Thursday following trials. But its efficacy against the South African variant fell markedly when including mild and moderate cases, results showed. The results announced Thursday were from final analyses, following interim results that were announced in late January. In a Phase 3 trial in […]