Drained and non-drained yoghurts have been used in the production of Labneh (concentrated yoghurt produced from cow's and goat's milk). The Labnehs were stored at 4 and 20 +/- 1 degreesC and the microbiological properties were determined during 6 months of storage. Total aerobic mesophilic bacteria counts, spore-forming bacteria counts, psychrotrophic bacteria counts decreased during 6 months of storage in both labnehs. Counts of yeast and moulds at both temperatures increased in the first 3 months of storage. Coliform bacteria were detected in the 1(st), 2(nd), 4(th), 5(th), 6(th) month for the samples stored at refrigerator temperatures and in the 1st, 5th, 6th month for those stored at room temperatures. Escherichia coli was found in none of the Labneh samples.