As per World Health Organization, COVID-19 spreads from person to person through respiratory droplets produced while coughing by a infected person. But there is very low risk that a person catch Coronavirus from a person who has no symptons. We shall always keep in mind that many people with COVID-19 disease infection experience only a mild symptons at their early stages. So, it is important that a person shall stay more than 1 meter (3 feet) away from a person who is sick. But sometimes, we can't identify infected person. So, you should follow the rule of maintaing the said distance in pandemic period with everyone you communicate with.