Research Article: Clinical Characteristics of Severe COVID- Patients During Omicron Epidemic and a Nomogram Model Integrating Cell-Free DNA for Predicting Mortality: A Retrospective Analysis
Introduction:
Coronavirus disease (COVID-) first broke out in Wuhan, China, in December . Subsequently, COVID- spread rapidly and widely, causing a pandemic. It has emerged as a well-known human pandemic over the last three years due to its high pathogenicity and infectivity, which posed serious risks to public health. According to data from the World Health Organization ( https://covid.who.int ), there were more than million confirmed cases of COVID- and more than . million deaths worldwide as of May , .
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