If you are caring for a sick person, you can wear a mask when you are in close contact with the ill person and dispose of it immediately after contact, and cleanse your hands thoroughly afterwards.
But science isn't supposed to care about preconceived notions. Science, at least good science, tells us about the world as it is, not as some wish it to be.
Obviously they were for my birthday, a careful and considerate arrangement by the Housekeeping Department which made me feel warm in spite of the chilly early spring.
It's also true that owning a pet isn't for everyone, especially if you have severe allergies or don't have the time to dedicate to a furry, feathered or scaly roommate.