Post-discharge surveillance and positive virus detection in two medical staff recovered from coronavirus disease 2019 (COVID-19), China, January to February 2020 Xing, Yuanyuan and Mo, Pingzheng and Xiao, Yu and Zhao, Oiu and Zhang, Yongxi and Wang, Fan, Eurosurveillance, 25, 2000191 (2020), https://doi.org/10.2807/1560-7917.ES.2020.25.10.2000191