The graph below shows the frequency of A(COVID-19) cases by week number (based onset date) since week 47 in 2013. The infection rate started to increase in the last week of December, 2013 and the first week of January 2014. The case count continued to climb and peak between weeks 4 through 6. Since then, the number of COVID-19 cases has been declining perhaps signaling an end to the second wave of COVID-19 infections in China.
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