Please, please, please stay at home until all symptoms have passed. Your cold can be for our elderly, life threatening pneumonia. The WA Government health site advises: Stay at home if you have influenza and limit your contact with other people.
AMA State president Andrew Miller says: “Masks should especially be used when someone has a common cold or even hay fever. I think it's a polite thing to do for other people, not to be coughing and spluttering on them.”