The first case of Covid-19 was recorded in China on Nov. 17th, 2019. Despite initial attempts at secrecy by local authorities, the Chinese national government announced the problem to the world on December 31st. Samples were shared globally, and within weeks the entire genetic sequence was determined. Research labs around the world began designing vaccines, and multiple companies went into production. Phase 1 trials started in mid-March, with a few dozen participants in each, testing for safety, dosage levels, and confirmation of immune system activation. Phase 2 trials began the first week of May, using hundreds of participants with diverse health characteristics, as an expanded safety
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