Article 5 COVID-19 5 coronavirus disease 2019 5 cycle threshold value human 5 Humans 4 Severe acute respiratory syndrome coronavirus 2 4 Female 3 Male 3 SARS-CoV-2 3 adult 3 controlled study 3 female 3 major clinical study 3 male 3 procedures 3 virology 3 Adult 2 Aged 2 COVID-19 Nucleic Acid Testing 2 COVID-19 Testing 2 Middle Aged 2 Real-Time Polymerase Chain Reaction 2 Young Adult 2 aged 2 diagnostic test accuracy study 2 middle aged 2 real time polymerase chain reaction 2 sensitivity and specificity 2 virus detection 2