The Niño Index influencing South Korea COVID-19 cases (represented by green curves) are much more h stable and constantly increasing as L increases while the South Korea COVID-19 cases influencing Niño Index (represented by black curves) are in a decreasing trend.
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Predicting COVID-19 Cases in South Korea Using Stringency and Niño Sea Surface Temperature Indices.
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The sentences
There were spikes of cases in the 34–35th week (August to September) (probably due to holidays) followed by an increasing trend of cases in the 40th week (October) onwards.