Microorganism
Water Treatment for Closed Heating and Cooling Systems (BG 50/2021), second edition, by Dr Pamela Simpson, published by BSRIA in 2021, defines a microorganism (or microbe) as: ‘Microscopic life forms that can thrive in water system including algae, fungi and bacteria.’
Legionnaires' Disease - Operation and Maintenance Log Book (BG 58/2015), written by Reginald Brown and Salim Deramchi, and published by BSRIA in May 2015, defines a microorganism or microbe as: ‘…an organism of microscopic size such as a bacterium, fungus or virus.’
--BSRIA
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