The fear of flying at Mount 50KThe scientists were working on estimating how quickly they could reconfigure their ChAdOx vaccine platform, the report said."The team do not currently think they will need to, but it would be stupid not to be prepared," the source told The Telegraph. "It should take a day or two to tweak the system."Suggesting that the vaccine might not work against the South African variant, the scientists said: The new study, conducted by the National Institute for Communicable Diseases in Johannesburg, showed the new South African variant could evade three classes of "therapeutically relevant monoclonal antibodies".An Oxford spokesman said the university is carefully assessing the impact of new variants on vaccine immunity.