First things first, we must familiarise ourselves with the ways in which COVID-19 is transmitted. Primarily, the virus spreads via respiratory droplets and via physical contact with contaminated surfaces.
The former are spread when someone coughs, sneezes and possibly, even when they breath or speak. The heavier the droplets, the more likely they are to fall to the ground rapidly, within a 1–metre radius.
If you’re in close contact with someone who has these respiratory symptoms, you’re at high risk of being exposed to potentially infective droplets (of anything really, not just COVID-19).
This is the main reason as to why you’ve heard the term ‘physical distancing’ so many times in the last few months.
Let’s say you’ve maintained adequate physical distancing from everyone who has coughed or sneezed. Have you considered that their droplets may have landed on surfaces such as doorknobs, lift buttons or counters? On these surfaces, the virus can remain viable and therefore, the immediate environment of an infected individual can serve as a source of transmission.