Thank you to Wendy Symonds (Northern Hygiene Laboratories Ltd) and Alannah Leanard (Complete Laboratory Solutions) for bringing to our attention that we hadn't quite reviewed all the dates correctly in the 2020 version of this publication. Furthermore, we can confirm that the only material change for this method is the change from Columbia Blood Agar to Columbia Agar.

With thanks to Ruairí McHugh and Robyn Reddington of Complete Laboratory Solutions for noticing an error in the 2015 publication of Part 6 – Methods for the isolation and enumeration of sulphite-reducing clostridia and Clostridium perfringens by membrane filtration from our Microbiology of Drinking Water series. The agar cited in the 2015 revision (Columbia Blood Agar) should have been Columbia agar as it had been in our 2010 publication of the same.

With thanks to Everyone who contributed to our first blue book for the Identification of Microorganisms using MALDI-TOF Mass Spectrometry. A fantiastic and innovative way to more reliably determine the identity of microorganisms isolated by culture methods.

The Quantification of Asbestos in Soil (2017) (Blue Book No. 256) has been withdrawn from publication

Thank you to Everyone who contributed to the 2020 revision of our blue book for the determination of Legionella bacteria in water samples by culture method

The Microbiology of Drinking Water - Part 7 - Methods for the enumeration of heterotrophic bacteria (2020) was revised to include a validated extension to the 20 minute time limit for adding agar to the sample