Biological particles emitted by humans are unique enough to identify that person, according to a study published on Tuesday.The report, published in PeerJ, found that it was possible to identify the airborne bacterial contribution of a single person, albeit sitting in a sanitized custom experimental climate chamber.To achieve the identification, air was sampled in an adjacent, identical, unoccupied chamber.”As soon as there's a person in the room, you start to find things like staphylococcus or streptococcus, things that we all have on us,” James Meadow, the paper's lead author and a scientist at Phylagen, a company that researches the microbiomes of public spaces like hospitals and offices, told The Atlantic.”In my office, when I walk across the room, I'm carrying behind me an invisible train of air. On a microscopic level, it might look something like an 18-wheeler going down a dusty road.”Previous studies have found that it's possible to lift someone's microbiome from surfaces they've touched, sequencing the DNA of bacteria left on kitchen counters, floors, and bathrooms for clues about the person who left them there.The researchers found that while diet and travel can change the airborne microbiome slightly, that for the most part, it will remain consistent over time.