Conclusion
Nowadays, Coronavirus Disease 2019 (COVID-19) is rampaging though the
world. Finding the source of infection and cutting off transmission are
important measures to control COVID-19 before the effective vaccine is
developed. However, as the epidemic progressed overtime,
more
and more asymptomatic cases brought huge challenges to the control of
COVID-19. This review provides relatively comprehensive and updated
information about asymptomatic cases of COVID-19. Further research into
the prevalence of asymptomatic infection of COVID-19 is necessary to
guide epidemic control efforts. All countries in the world should raise
public awareness of protection and strengthen social security measures
to prevent second outbreak caused by asymptomatic infection.