Asymptomatic patients as a source of COVID-19 infections: A systematic review and meta-analysis

• Published in: International journal of infectious diseases Vol. 98; pp. 180 - 186
• Main Authors: Kronbichler, Andreas, Kresse, Daniela, Yoon, Sojung, Lee, Keum Hwa, Effenberger, Maria, Shin, Jae Il
• Format: Journal Article
• Language: English
• Published: Canada Elsevier Ltd 01.09.2020; The Authors. Published by Elsevier Ltd on behalf of International Society for Infectious Diseases; Elsevier
• Subjects: Asymptomatic; Betacoronavirus; Coronavirus disease-19 (COVID-19); Coronavirus Infections - diagnostic imaging; COVID-19; Disease Progression; Humans; Meta-analysis; Pandemics; Pneumonia, Viral - diagnostic imaging; SARS-CoV-2; Tomography, X-Ray Computed; Coronavirus disease-19 (COVID-19); SARS-CoV-2; Asymptomatic; Meta-analysis
• ISSN: 1201-9712; 1878-3511
• DOI: 10.1016/j.ijid.2020.06.052

•Asymptomatic patients with COVID-19 tend to be younger and may be more socially active.•Laboratory findings in most asymptomatic cases were unremarkable.•Around half of the cases had lung opacities, most frequently ground glass opacities.•Patients with normal CT were younger than patients with abnormal CT. Coronavirus Disease 2019 (COVID-19) is characterized by an unpredictable disease course, ranging from asymptomatic to severe, life-threatening infections. Asymptomatic COVID-19 infections have been described, and the aim of this systematic review was to summarise their presentation forms. We searched PubMed® and Google® (1 December 2019 to 29 March 2020) and extracted age, laboratory findings, and computed tomography (CT) scans. Pooled incidence rates of clinical characteristics were analyzed using random-effect models. In total, 506 patients from 34 studies (68 single cases and 438 from case-series) with an asymptomatic course were identified. Patients with normal radiology were younger (19.59 ± 17.17 years) than patients with abnormal radiology (39.14 ± 26.70 years) (p-value = 0.013). Despite being asymptomatic, CT investigations revealed abnormalities in 62.2% of the cases; ground-glass opacities were most frequently observed (43.09% by meta-analysis). Most studies reported normal laboratory findings (61.74% by meta-analysis). More than half of the patients without any symptoms present with CT abnormalities. Asymptomatic patients may be contagious and thus a potential source of transmission of COVID-19.