The human coronavirus is shutting down the all world with massive quarantine orders for fear to spread further the disease. Over 250,000 people worldwide have been infected already. But to avoid this number that is going to increase exponentially we could all imitate Hong kong and wear mask against virus.
The Control Disease Center (CDC) recommend wearing a best sleep mask for travel for anybody that has already a sickness such as the flu or any other precondition. You can read more about the mers disease in our Guide.