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(During an epidemic, every current curve declines in the final days because not all new cases have been detected yet.)
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Interventions graphic from: Characteristics of and Important Lessons From the Coronavirus Disease 2019 Outbreak in China: jamanetwork.com/journals/jama/fullarticle/2762130 The Figure 3 graphic comes from the WHO China Mission which concluded: "This decline in COVID-19 cases across China is real."
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Detailed description of extended holiday and travel restrictions in China here: thelancet.com/journals/lancet/article/PIIS0140-6736(20)30421-9/fulltext