Further sets of data received from CTFT (France) after 18 months exposure, BAM (Germany) after 18 months exposure, STU (Sweden) after 9.5 months exposure and TI (Denmark) after 12 and 17.5 months exposure are presented and discussed in conjunction with data previously reported. The new data are generally in agreement with those presented previously and indicate the major difference between the co-operating Institutes is one of the rate of colonisation rather than any relative difference in performance of the treatments. Overall 0.5% TnBTO 1 min dip treatment is providing least protection followed by 1.0% TnBTO 1 min dip. Both double vacuum treatments are providing better protection with little difference between 0.5% and 1.0% TnBTO.

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