On March 11, 2020, the World Health Organization declared COVID-19, caused by the SARS-CoV-2 coronavirus, a global pandemic. First identified in Wuhan, China, in December 2019, the virus spread rapidly worldwide. Governments imposed unprecedented lockdowns and travel restrictions. The pandemic killed millions, devastated economies, and accelerated changes in remote work, education, and healthcare. The rapid development of mRNA vaccines represented a landmark achievement in medical science.
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