[1] Chinese Center for Disease Control and Prevention. Guidelines for COVID-19 epidemiological investigations. China CDC Wkly 2020;2(19):327 − 8. http://dx.doi.org/10.46234/ccdcw2020.083CrossRef
[2] Wang P, Lian ZY, Chen Y, Qi Y, Chen HJ, An XD. Investigation of a cluster of 2019 Novel Coronavirus Disease (COVID-19) with possible transmission during the incubation period—Shenyang City, China, 2020. China CDC Wkly 2020;2(8):125 − 7. http://dx.doi.org/10.46234/ccdcw2020.034CrossRef
[3] Chinese Center for Disease Control and Prevention. Technical guidelines for COVID-19 laboratory testing. China CDC Wkly 2020;2(19):332 − 6. http://dx.doi.org/10.46234/ccdcw2020.085CrossRef
[4] Rivett L, Sridhar S, Sparkes D, Routledge M, Jones NK, Forrest F, et al. Screening of healthcare workers for SARS-CoV-2 highlights the role of asymptomatic carriage in COVID-19 transmission. eLife 2020;9:e58728. http://dx.doi.org/10.7554/eLife.58728CrossRef
[5] Yu XX, Yang RR. COVID-19 transmission through asymptomatic carriers is a challenge to containment. Influenza Other Respir Viruses 2020;14(4):474 − 5. http://dx.doi.org/10.1111/irv.12743CrossRef
[6] Han DS, Li R, Han YX, Zhang R, Li JM. COVID-19: insight into the asymptomatic SARS-COV-2 infection and transmission. Int J Biol Sci 2020;16(15):2803 − 11. http://dx.doi.org/10.7150/ijbs.48991CrossRef