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. 2020 Aug 20;8:153479–153507. doi: 10.1109/ACCESS.2020.3018140

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This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/

This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/

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FIGURE 4. — Second waves of COVID-19 in (a) Iran [38], (b) South Korea [38], (c) United States [38], and (d) Singapore [38]. In these countries, the government started easing restrictions too soon, which results in a second wave.