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Highly sensitive quantification of plasma SARS-CoV-2 RNA shelds light on its potential clinical value

Abstract : Background. Coronavirus disease 2019 (COVID-19) is a global public health problem that has already caused more than 662,000 deaths worldwide. Although the clinical manifestations of COVID-19 are dominated by respiratory symptoms, some patients present other severe damage such as cardiovascular, renal and liver injury or/and multiple organ failure, suggesting a spread of the SARS-CoV-2 in blood. Recent ultrasensitive polymerase chain reaction (PCR) technology now allows absolute quantification of nucleic acids in plasma. We herein intended to use the droplet-based digital PCR technology to obtain sensitive detection and precise quantification of plasma SARS-CoV-2 viral load (SARSCoV-2 RNAaemia) in hospitalized COVID-19 patients.Methods. Fifty-eight consecutive COVID-19 patients with pneumonia 8 to 12 days after onset of symptoms and 12 healthy controls were analyzed. Disease severity was categorized as mild-to-moderate in 17 patients, severe in 16 patients and critical in 26 patients. Plasma SARS-CoV-2 RNAaemia was quantified by droplet digital Crystal Digital PCR™ nextgeneration technology (Stilla Technologies, Villejuif, France).Results. Overall, SARS-CoV-2 RNAaemia was detected in 43 (74.1%) patients. Prevalence of positive SARS-CoV-2 RNAaemia correlated with disease severity, ranging from 53% in mild-to-moderate patients to 88% in critically ill patients (p=0.036). Levels of SARS-CoV-2 RNAaemia were associated with severity (p=0.035). Among nine patients who experienced clinical deterioration during follow-up, eight had positive SARS-CoV-2 RNAaemia at baseline while only one critical patient with undetectable SARS-CoV-2 RNAaemia at thetime of analysis died at day 27.Conclusion. SARS-CoV-2 RNAaemia measured by droplet-based digital PCR constitutes a promising prognosis biomarker in COVID-19 patients.
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Submitted on : Friday, November 6, 2020 - 3:51:48 PM
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David Veyer, Solen Kernéis, Geoffroy Poulet, Maxime Wack, Nicolas Robillard, et al.. Highly sensitive quantification of plasma SARS-CoV-2 RNA shelds light on its potential clinical value. Clinical Infectious Diseases, Oxford University Press (OUP), 2020, pp.ciaa1196. ⟨10.1093/cid/ciaa1196⟩. ⟨inserm-02992971⟩



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