Well to answer this question we will have to look how the novel covid spreads .
It spreads by touching something carrying it amd touching our eyes nose or mouth or it can also spread by droplets by sneezes and cough.
Only wearing mask is not safe because if we keep on touching things and then touch eyes mouth or nose or have contact with the infected we can have it so not only wear mask but stopping touching hand shacking or hugging people as they might also be the carriers of this virus .
So not only the people who get symptoms are the one infected but there can be silent carriers too .
bioresearch.science.com 