The mere presence of a person in a room adds 37 million bacteria to the air every hour.. These are mainly bacteria left by other residents and those that have risen from the floor..

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Overall, the scientists found that human presence was associated with a significant increase in airborne concentrations of bacteria and fungi of varying sizes.. The growth of large particles of fungi and medium-sized bacteria especially increased. The size of bacteria and fungi matters, as this affects the extent to which they will be filtered through the air, or remain and recirculate in the air..

The researchers found that about 18 percent of bacteria emissions in the room, including both fresh and previously deposited bacteria, came from humans.. Of the 15 most abundant bacterial species found in the room, four are directly related to humans, including the most abundant bacterial species, Propionibacterineae, which is common on human skin..

Experts emphasize that the carpets in the room hold most of the microorganisms, but this does not mean that they should be removed from the room.. An extremely small number of microorganisms, less than 0.1 percent, are infectious. However, the knowledge gained during the study will help in the future to find ways to improve the quality of air in the house.. After all, all the infectious diseases that we become infected with, we get while indoors..

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