Ester C Sabino1, Paula Loureiro2, Maria Esther Lopes3, Ligia Capuani1, Christopher McClure4, Dhuly Chowdhury4, Claudia Di-Lorenzo-Oliveira5, Lea C Oliveira1, Jeffrey M Linnen6, Tzong-Hae Lee7, Thelma Gonçalez7, Donald Brambilla4, Steve Kleinman8, Michael P Busch9, Brian Custer9. 1. Departamento de Moléstias Infecciosas e Parasitárias, Instituto de Medicina Tropical, Universidade de São Paulo. 2. Faculdade de Ciências Médicas-UPE/Fundação Hemope, Recife. 3. Fundação Hemorio, Rio de Janeiro, Brazil. 4. RTI International, Rockville, Maryland. 5. Universidade Federal de São Joao del Rey, Divinopolis, Brazil. 6. Hologic, San Diego. 7. Blood Systems Research Institute, San Francisco, California. 8. Blood Systems Research Institute, San Francisco, California University of British Columbia, Vancouver, Canada. 9. Blood Systems Research Institute, San Francisco, California Department of Laboratory Medicine, University of California-San Francisco.
Abstract
BACKGROUND: A linked donor-recipient study was conducted during epidemics in 2 cities in Brazil to investigate transfusion-transmitted (TT) dengue virus (DENV) by DENV RNA-positive donations. METHODS: During February-June 2012, samples were collected from donors and recipients and retrospectively tested for DENV RNA by transcription-mediated amplification. Recipient chart review, using a case (DENV positive)-control (DENV negative and not known to be exposed) design, was conducted to assess symptoms. RESULTS: Of 39 134 recruited blood donors, DENV-4 viremia was confirmed in 0.51% of donations from subjects in Rio de Janeiro and 0.80% of subjects in Recife. Overall, 42 DENV RNA-positive units were transfused into 35 recipients. Of these, 16 RNA-positive units transfused into 16 susceptible recipients were identified as informative: 5 cases were considered probable TT cases, 1 possible TT case, and 10 nontransmissions. The TT rate was 37.5% (95% confidence interval [CI], 15.2%-64.6%), significantly higher than the viremia rate of 0.93% (95% CI, .11%-3.34%) in nonexposed recipients (P < .0001). Chart review did not find significant differences between cases and controls in symptoms or mortality. CONCLUSIONS: During a large epidemic of DENV-4 infection in Brazil, >0.5% of donations were RNA positive, and approximately one third of components resulted in TT. However, no significant clinical differences were evident between RNA-positive and RNA-negative recipients.
BACKGROUND: A linked donor-recipient study was conducted during epidemics in 2 cities in Brazil to investigate transfusion-transmitted (TT) dengue virus (DENV) by DENV RNA-positive donations. METHODS: During February-June 2012, samples were collected from donors and recipients and retrospectively tested for DENV RNA by transcription-mediated amplification. Recipient chart review, using a case (DENV positive)-control (DENV negative and not known to be exposed) design, was conducted to assess symptoms. RESULTS: Of 39 134 recruited blood donors, DENV-4 viremia was confirmed in 0.51% of donations from subjects in Rio de Janeiro and 0.80% of subjects in Recife. Overall, 42 DENV RNA-positive units were transfused into 35 recipients. Of these, 16 RNA-positive units transfused into 16 susceptible recipients were identified as informative: 5 cases were considered probable TT cases, 1 possible TT case, and 10 nontransmissions. The TT rate was 37.5% (95% confidence interval [CI], 15.2%-64.6%), significantly higher than the viremia rate of 0.93% (95% CI, .11%-3.34%) in nonexposed recipients (P < .0001). Chart review did not find significant differences between cases and controls in symptoms or mortality. CONCLUSIONS: During a large epidemic of DENV-4 infection in Brazil, >0.5% of donations were RNA positive, and approximately one third of components resulted in TT. However, no significant clinical differences were evident between RNA-positive and RNA-negative recipients.
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