There’s no such thing as living alone. Never mind if you’re the only person in your house and have no dog, no cat, not even fish. You’ve still got at least several billion roommates—and so do we all. Some of them are harmless, some are actually helpful and some could, in the right concentration and the wrong circumstance, kill you. They are, of course, bacteria, fungi and viruses, and like it or not, they’re on you, around you and deeply within you.
Read more the article: Your Tiny Roommates: Meet the Microbes Living in Your Home (image adapted from getty images)