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Contamination profile in allografts retrieved from multitissue donors: longitudinal analysis.

Cell and Tissue Banking 2018 November 22
Microbiological contamination of retrieved tissues has become an issue of key importance and is a critical aspect of allograft safety, especially in the case of multi-tissue donations, which frequently become contaminated during retrieval and handling. We analysed contamination in 11,129 tissues with a longitudinal contamination profile for each individual tissue. Specifically, 10,035 musculoskeletal tissues and 1094 cardiovascular tissues were retrieved from a total of 763 multi-tissue donors, of whom 105 heart-beating organ donors and 658 deceased tissue donors. Of the 1955 tissues found to be contaminated after the first decontamination step, 1401 tissues (72%) were contaminated by the same species as the one(s) isolated at retrieval (Time1 ) and 554 (28%) by different species. Among the 113 tissues testing positive after the 2nd decontamination (Time3 ), 36 tissues (32%) were contaminated by the same species detected at Timel while the contaminating species differed from Time1 in 77 tissues (68%). The higher the number of contaminating species per tissue the higher the percentage of tissues in which contamination changed over time compared to Time1 . The analysis revealed a 28% incidence of new species in tissues already testing positive after retrieval and of 3.5% of tissues becoming positive after admission to the tissue bank. Of these, coagulase-negative Staphylococcus accounted for over 70% of new contaminations.

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