Add this result to my export selection UK SMI B 40: investigation of specimens for Mycobacterium species (PDF) Source: GOV UK (Add filter) Source: Public Health England - PHE (Remove filter) Published by Public Health England, 02 November 2020 washings should be neutralised by adding approximately 100mg of sodium carbonate to approximately 50mL of the specimen if processing is... Type: Policy and Strategy (Remove filter)