HuffPost – Johnson & Johnson has temporarily halted its trial of a vaccine for COVID-19 after a test volunteer developed a mysterious illness. It’s the second time in two months that a COVID-19 vaccine trial has been halted following an unexplained illness in a test subject, raising concerns about the safety of the vaccines and dampening expectations of a quick fix for the pandemic. Researchers conducting the Johnson & Johnson trial, which includes 60,000 volunteers around the world…

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