Why were Covid vaccine trials so fast?

According to Hacker News, a new explainer examines why COVID-19 vaccine development proceeded at unprecedented speed. The rapid timeline wasn't achieved by skipping safety steps — rather, the vaccines benefited from parallel rather than sequential trial phases. Researchers ran Phase One, Two, and Three trials simultaneously instead of waiting for each to conclude before starting the next. Massive government funding removed financial constraints, allowing manufacturers to scale production while trials were still underway. The vaccines also built on decades of mRNA platform research, so scientists didn't start from scratch. Emergency Use Authorization from regulators expedited the approval process without eliminating scrutiny. Most of the speed came from eliminating administrative delays and bureaucratic waiting periods, not from cutting corners on efficacy or safety monitoring.

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