PREVENTION of TRANSFUSION-ASSOCIATED CHAGAS-DISEASE - EFFICACY of WHITE CELL-REDUCTION FILTERS in REMOVING TRYPANOSOMA-CRUZI FROM INFECTED BLOOD

PREVENTION of TRANSFUSION-ASSOCIATED CHAGAS-DISEASE - EFFICACY of WHITE CELL-REDUCTION FILTERS in REMOVING TRYPANOSOMA-CRUZI FROM INFECTED BLOOD

Author Moraessouza, H. Google Scholar
Bordin, J. O. Google Scholar
Bardossy, L. Google Scholar
Macpherson, D. W. Google Scholar
Blajchman, M. A. Google Scholar
Institution MCMASTER UNIV
CANADIAN RED CROSS SOC
Universidade Federal de São Paulo (UNIFESP)
Abstract Background: Transfusion-associated Chagas' disease (TA-CD) is a worldwide problem. Measures adopted to prevent TA-CD include the clinical and serologic screening of blood donors and/or the inactivation of Trypanosoma cruzi present in collected blood, using gentian violet as the trypanocidal agent, This study investigated the efficacy of white cell-reduction filters in removing T. cruzi from infected blood.Study Design and Methods: Human blood was contaminated with 2 or 150 T. cruzi parasites per ml and then left unfiltered or filtered with white cell-reduction filters that provided either 2, 3, or 6 log(10) white cell removal. the efficacy of the parasite removal of these filters was evaluated by microscopic enumeration of active forms of T. cruzi both in vivo and in vitro. the in vivo experiments were done in Swiss mice that had been intraperitoneally inoculated with T. cruzi-infected human blood. the in vitro experiments were performed with fresh human blood that had been deliberately contaminated with T. cruzi.Results: the number of parasites seen in mice inoculated with unfiltered blood containing 2 or 150 parasites per ml was significantly higher than the number of parasites seen in mice inoculated with blood from the same sample, but filtered with white cell-reduction filters providing 3 or 6 log(10) white cell removal. Fifty to 70 percent of the mice given T. cruzi-infected (2 parasites/ml) filtered blood did not develop T. cruzi infection. in vitro, the use of white cell-reduction filters, providing 2, 3, or 6 log(10) white cell removal, significantly reduced the number of parasites seen in culture.Conclusion: the present experimental data provide evidence that white cell-reduction filters are effective in reducing the number of parasites in T. cruzi-infected blood and that this efficacy depends, in part, on the concentration of parasites in the artificially infected blood. Properly designed clinical studies of known carriers of T. cruzi must be conducted to determine whether the use of white cell-reduction filters may be an alternative method of reducing the incidence of TA-CD.
Language English
Date 1995-09-01
Published in Transfusion. Bethesda: Amer Assoc Blood Banks, v. 35, n. 9, p. 723-726, 1995.
ISSN 0041-1132 (Sherpa/Romeo, impact factor)
Publisher Amer Assoc Blood Banks
Extent 723-726
Origin http://dx.doi.org/10.1046/j.1537-2995.1995.35996029154.x
Access rights Closed access
Type Article
Web of Science ID WOS:A1995RW51300003
URI http://repositorio.unifesp.br/handle/11600/25525

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