Feuer, W. and Higgins-Dunn, N.(2020). Asymptomatic spread of coronavirus is ‘very rare,’ WHO says, Health and Science, CNBC. https://www.cnbc.com/2020/06/08/asymptomatic-coronavirus-patients-arent-spreading-new-infections-who-says.html. (Retrieved: March 1, 2009).
Hu, Z.,Song, C.,Xu, C.,Jin, G.,Chen, Y.,Xu, X.,Wang, J.(2020).Clinical characteristics of 24 asymptomatic infections with COVID-19 screened among close contacts in Nanjing, China.Science China Life Sciences.63(5),706-711.
La Marca, A., Capuzzo, M., Paglia, T., Roli, L., Trenti, T. and Nelson, S. M. (2020). Testing for SARS-CoV-2 (COVID-19): a systematic review and clinical guide to molecular and serological in-vitro diagnostic assays. Reproductive biomedicine online. https://www.rbmojournal.com/article/S1472-6483(20)30318-7/fulltext (Retrieved: August 31, 2009).