Further sets of data received from STU (Sweden) after 36 months exposure and Sipad-IRC (Yugoslavia) after 45 months exposure are presented and discussed in conjunction with data reported previously. The new data are generally in agreement with those presented previously and the major difference between institutes continues to be one of rate of colonisation rather than any relative difference in performance of the treatments. Some data from the co-operating institutes is still outstanding. A final report summerising the whole trial will now be produced.

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