Effective removal of yersinia enterocolitica in red cells MAP through leukocyte-depleted filters. Relation Between its Contaminated Amount and Removal Times.:Relation Between its Contaminated Amount and Removal Times
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The growth of Yersinia enterocolitica in the stored red cell MAP (RC-MAP) units and the effect of leukocyte-depletion with filters on Y. enterocolitica growth were examined. Y. enterocolitica was inoculated into whole blood units just before RC-MAP units were prepared. These units were divided into two portions, the one stored at various times after removal of leukocyte through the filters (LPRC group), and the other stored without any process (control group). Inoculated amount of Y. enterocolitica were 0.1-4.4CFU/ml (S group, n=4), 78-82CFU/ml (M group n=3) and 200CFU/ml or more (L group, n=4).In S group, Y. enterocolitica did not grow, probably due to phagocytosis and bactericidal activity of leukocytes. In M group, the growth of Y. enterocolitica was observed after storage of 14 days and total amount of Y. enterocolitica reached 5.3×108-6.8×108CFU/ml on 42nd day. In Lgroup, the growth of Y. enterocolitica was found only in 2 out of 4 inoculated samples at 7th day and later observed in the rest of the samples, up to the amount of 2.6×108-1.4×109CFU/ml on 42nd day. On the other hand, each control group of S, M and L group in which leukocytes were removed through the filters 24 hours after blood collection, showed no bacterial growth during 42 days, regardless of inoculated amount of Y. enterocollotica. This means that Y. enterocolitica together with leukocytes are eliminated through the filter.This study suggest that the filtration of blood through leukocyte-depleted filters at least within 24 hours after blood collection is an effective measure to prevent Y. enterocolitica infection.
- 一般社団法人 日本輸血・細胞治療学会の論文
一般社団法人 日本輸血・細胞治療学会 | 論文
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