Unprecedented Vaccine Trials On Track To Begin Delivering Results


The participants, the study investigators and even the companies running the trials do not know who received the real vaccine and who received a jab of saline. It’s only when the trial clock chimes — when a certain number of infections have occurred — that expert committees can peer beyond the firewall to see whether there’s an early signal that the vaccine works. Those experts, who form a data-safety and -monitoring board, can review whether those who received a particular vaccine are protected, exhibiting fewer infections than are observed among those who got a placebo — and they recommend to an oversight group whether the shots are ready for consideration by regulators.

Source : https://www.washingtonpost.com/health/2020/10/21/vaccine-progress-coronavirus/

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