A fogger is any device that creates “fog”, or very fine mist, from a liquid. They are typically filled with disinfectants.

There is no evidence that foggers are useful in a room with people present, and they may cause harm.

Fogging devices may have some use for cleaning surfaces in empty rooms, providing that managing human exposure and potential surface damage is considered.

Also, there is no evidence that spraying people with any form of disinfectant will reduce transmission of COVID-19 or any other disease, and the act of spraying in an occupied space is likely to be harmful.

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