Comparison of Real-time RT-PCR cycle threshold (Ct) values with clinical features and severity of COVID-19 disease among hospitalized patients in the first and second waves of COVID-19 pandemic in Chennai, India.

The findings revealed that during the first and second waves of the pandemic, there was a highly significant difference in Ct values among moderate COVID-19 patients (p value = 0.003) and a substantial difference in Ct values among mild COVID-19 patients (p value = 0.023) [ Fig 3 ].

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