Experts are warning that at least half of COVID-19 cases seen globally may have come from asymptomatic carriers.
Symptom-free infected people are unknowingly spreading the virus to others according to a new study.
Nearly one in four cases of virus spread involve infected people who remain symptom-free.
The findings of the study highlight the importance of social distancing, mask-wearing, and hand-washing.
The study co-author said: "To control the pandemic, we must address the 'silent pandemic' of spread from persons without symptoms".
