Journals / Mikrobiyoloji Bülteni / 2021 / Cilt: 55 - Sayı: 3

Comparison of Real Time PCR Cycle Threshold Values in Symptomatic and Asymptomatic COVID-19 Patients

Semptomatik ve Asemptomatik COVID-19 Hastalarında Gerçek Zamanlı PCR Döngü Eşik Değerlerinin Karşılaştırılması

Pages
435–444
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Although Ct and CRP values are thought to be useful in monitoring the clinical course and prognosis of patients with COVID-19, more detailed studies are needed to prove their clinical value.

📌 3 Key Takeaways

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Objective & Hypothesis:Patients infected with severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) show different clinical courses ranging from asymptomatic to severe infection requiring intensive care treatment and death.
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Key Findings & Data:Real-time reverse transcription polymerase chain reaction (rRT-PCR), used in the diagnosis, screening and surveillance of Coronavirus Disease 2019 (COVID-19), provides the viral load as a cycle threshold (Ct) value.
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Conclusion & Impact:Although Ct and CRP values are thought to be useful in monitoring the clinical course and prognosis of patients with COVID-19, more detailed studies are needed to prove their clinical value.
🔬Design:Research Article
📍Scope:2019 Verileri
⚙️Variables:Domain Parameters

Abstract

Patients infected with severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) show different clinical courses ranging from asymptomatic to severe infection requiring intensive care treatment and death. Real-time reverse transcription polymerase chain reaction (rRT-PCR), used in the diagnosis, screening and surveillance of Coronavirus Disease 2019 (COVID-19), provides the viral load as a cycle threshold (Ct) value. It has been reported that the Ct value may be related to the course of the infection and the clinical condition of the patient. In this study, it was aimed to compare the Ct and C reactive-protein (CRP) results of symptomatic and asymptomatic patients who were found to be positive with rRT-PCR. Between 14 April and 29 August 2020, a total of 355 patients aged 18 years and older with positive SARS-CoV-2 rRT-PCR test were included in the study. The COVID-19 rRT-PCR test was performed with Bio-speedy SARS-CoV-2 rRT-PCR kit (Bioeksen, Turkey) versions, the kit targeting the RdRp gene region, and the dual gene kit versions targeting the N and ORF1ab gene regions were used. Patients were classified as symptomatic and asymptomatic according to their clinical findings. Ct and CRP results of the patients were analyzed statistically. Of the 355 patients included in the study, 237 (66.7%) were symptomatic and 118 (33.2%) were asymptomatic patients. The mean age of symptomatic patients (46.68 ± 18.03) was observed significantly higher than asymptomatic patients (38.27 ± 13.82) (p 0.05). As a result, it was observed that SARS-CoV-2 PCR positive patients were symptomatic in the presence of advanced age and comorbidity. Increased CRP value at the time of admission to the hospital was found significantly higher in symptomatic patients. Ct value has been shown to be lower in symptomatic patients, as expected. Although Ct and CRP values are thought to be useful in monitoring the clinical course and prognosis of patients with COVID-19, more detailed studies are needed to prove their clinical value.

Özet

Şiddetli akut solunum sendromu koronavirüs-2 (SARS-CoV-2) ile enfekte hastalar, asemptomatikten yoğun bakım tedavisi gerektiren ciddi enfeksiyona ve ölüme kadar değişen farklı klinik seyirler gösterir. Koronavirüs hastalığı-2019 (COVID-19)’un tanı, tarama ve sürveyansında kullanılan gerçek zamanlı revers transkriptaz polimeraz zincir reaksiyonu (rRT-PCR), örnekteki viral yükün ölçüsünü döngü eşik değeri [cycle threshold (Ct)] olarak sağlar. Ct değerinin enfeksiyonun seyri ve hastanın klinik durumu ile ilişkili olabileceği bildirilmiştir. Bu çalışmada, rRT-PCR ile pozitif bulunan semptomatik ve asemptomatik hastaların Ct ve C-reaktif protein (CRP) sonuçlarının karşılaştırılması amaçlanmıştır. Çalışmaya 14 Nisan-29 Ağustos 2020 tarihleri arasında SARS-CoV-2 rRT-PCR testi pozitif, 18 yaş ve üzeri 355 hasta dahil edilmiştir. COVID-19 rRT-PCR testi, Bio-speedy SARS-CoV-2 rRT-PCR kit (Bioeksen, Türkiye) versiyonları ile yapılmış, RdRp gen bölgesini hedefleyen kit, N ve ORF1ab gen bölgelerini hedefleyen çift gen kit versiyonları kullanılmıştır. Çalışmada hastaların semptom, yaş, cinsiyet ve altta yatan hastalık verileri değerlendirilmiştir. COVID-19 PCR testi pozitif hastalar klinik bulgularına göre semptomatik ve asemptomatik olarak sınıflandırılmıştır. Hastaların Ct ve CRP sonuçları istatistiksel olarak analiz edilmiştir. Çalışmaya dahil edilen 355 hastanın 237 (%66.7)’si semptomatik, 118 (%33.2)’i asemptomatik hastalardan oluşmaktadır. Semptomatik hastaların yaş ortalaması (46.68 ± 18.03); asemptomatik hastalardan (38.27 ± 13.82) daha yüksek gözlenmiştir (p 0.05). Sonuç olarak çalışmada SARS-CoV-2 PCR pozitif hastaların ileri yaş ve komorbidite varlığında semptomatik seyrettiği görülmüştür. Hastaların hastaneye başvuru sırasındaki artmış CRP değeri semptomatik hastalarda daha yüksek saptanmıştır. Ct değerinin ise beklenildiği gibi semptomatik hastalarda daha düşük olduğu ortaya konmuştur. Ct ve CRP değerlerinin COVID-19’lu hastaların klinik seyrini ve prognozunu takip etmede faydalı olabileceği düşünülmekle beraber klinik değerini kanıtlamak için daha ayrıntılı çalışmalara ihtiyaç vardır.

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Cite This Article

GÜLBUDAK, H., KARVAR, Ş., SOYDAN, G., ÜLGER, S. T., ASLAN, G., KANDEMİR, Ö., TAMER, L., ALTUNKAN, A. A., ÖZDEMİR, A. A. (2021). Comparison of Real Time PCR Cycle Threshold Values in Symptomatic and Asymptomatic COVID-19 Patients. Mikrobiyoloji Bülteni, Cilt: 55 - Sayı: 3, 435–444. https://ajindex.com/articles/341058

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