Karimzadeh, S., Bhopal, R. & Nguyen Tien, H. 2021, 'Review of infective dose, routes of transmission and outcome of COVID-19 caused by the SARS-COV-2: comparison with other respiratory viruses', Epidemiology and Infection, 149, pp. e96 -. https://doi.org/10.1017/S0950268821000790