Medical masks cannot protect against the new Coronavirus when used alone. Once you wear them, you want to combined with hand hygiene and other preventive measures. WHO(World Health Organization) only recommends the utilization of masks in specific cases.
If you have cough, fever and difficulty breathing, you should wear a mask and seek medical aid.
If you do not have these symptoms, you do not need to wear masks because there’s no evidence that they protect people who aren’t sick.
However, if you’re healthy but you’re taking care of someone who could also be infected with the new corona virus, then you should wear a mask whenever you’re within the same room with that person.
And remember, if you select to wear a mask, use it and discard it properly and clean your hands with alcohol hand rub or soap and water.