Biospecimen repositories: are blood donors willing to participate?

BACKGROUND: Sponsored by the National Heart, Lung, and Blood Institute, the Retrovirus Epidemiology Donor Studies (REDS‐I/‐II) have conducted epidemiologic, laboratory, and survey research on volunteer blood donors. Some studies request additional permission to store biospecimens for future studies. The representativeness and applicability of studies performed using repositories may be reduced by low participation rates. STUDY DESIGN AND METHODS: Demographics from subjects consenting to participate in the 2007 REDS‐II Leukocyte Antibodies Prevalence Study (LAPS) repository were compared to “study‐only” subjects. Data from the 1998 REDS‐I survey of donor opinion regarding storage and use of biospecimens were also explored. RESULTS: Overall, 91% of LAPS subjects agreed to participate in the repository. Odds of repository participation were lower among African American and Hispanic donors, 35‐ to 44‐year‐olds, donors who had not completed high school, and donors from one geographic location, regardless of other variables. Survey data from 1998 revealed that 97% of respondents approved of long‐term storage of biospecimens, although only 87% indicated that they would personally participate. Many respondents would require notification or their permission be obtained before participation. Minority respondents would require permission or notification more often and were less certain they would personally participate in a repository. CONCLUSION: Blood donors are quite willing to participate in biospecimen repositories. Regional differences and lower odds of participation in the minority blood donor population may result in a reduced number of biospecimens available for study and a decreased ability to definitely answer specific research questions in these populations.     

Do blood donors read and understand screening educational materials?

BACKGROUND: Blood donors with high-risk behaviors may not self-defer because they failed to read or understand the screening educational materials. STUDY DESIGN AND METHODS: In 1993, a total of 34,726 allogeneic donors responded to an anonymous mail survey of 50,162 donors that inquired about demographics, donor status, amount of the donor educational materials read, new HIV knowledge gained, and donors' opinions on the length and difficulty of materials. RESULTS: Although 78 percent reported reading all materials, only 32 percent indicated reading carefully; 34 percent learned new information about HIV and 95 percent perceived the materials as easy to understand. First-time donors were more likely to read carefully (OR, 7.9) and gain more HIV knowledge from the materials (OR, 1.9) than repeat donors. Minority, less educated, screening test-reactive, and HIV test-seeking donors reported reading the materials more carefully and learning more about HIV than their respective counterparts. Donors with less education, those with reactive screening tests, those seeking HIV test results, and those not reporting a risk behavior were more likely to find the materials difficult to understand. CONCLUSION: Most donors reported skimming and not having difficulty understanding the educational materials. Some donors may be aware that they should not donate or are failing to assimilate the information in the materials. Methods to present information more clearly and concisely are clearly needed. However, some high-risk donors may still continue donating no matter how improved the educational materials are.     

Asymptomatic carriage of malaria parasites in blood donors in Yaoundé

Background: Malaria can be transmitted through blood transfusion, but there is paucity of data concerning transfusion‐transmitted malaria in Cameroun. Objective: To determine prevalence of malaria infection and association with epidemiological and clinical data obtained from donors' responses. Methods: Microscopic examination of stained thick and thin blood smears for the detection, quantification and specification of Plasmodium sp was performed on 493 blood donors in two main hospitals in Yaoundé during October and November 2007. Results: Overall 6·5% of blood donors were detected positive for Plasmodium sp infection: 90·6% was Plasmodium falciparum and 9·4% was Plasmodium malariae. Parasite counts ranged from 80 to 800 µL^?1 with a median of 320 µL^?1. Asexual and sexual forms were found in 75·9 and 24·1% of cases, respectively. Age, sex, type of blood donor (voluntary non‐remunerated vs familial/replacement) and fate of blood donation (selected vs discarded) did not affect the prevalence of malaria carriage. The lack of malaria prophylaxis as well as the manifestation of malaria symptoms within 2 weeks and 1 month preceding blood donation were significantly associated with high frequency of parasites carriage. Conclusion: Malaria parasites carriage is frequent among blood donors in Yaoundé. These data seem to describe high‐risk donor profile and may help improving blood safety related to transfusion‐transmitted malaria in Cameroon.     

Turbid plasma donations in whole blood donors: fat chance?

BACKGROUND: Blood donations resulting in “nontransparent turbid milky” plasma must be discarded. The aim of this study was to objectively determine opacity and to identify risk factors for turbid plasma donations. STUDY DESIGN AND METHODS: This case‐control study included 238 whole blood donors who provided turbid plasma (cases) and 309 random control subjects with normal plasma. Participants filled in a questionnaire regarding cardiovascular risk factors. Fat intake was assessed using a validated questionnaire. Opacity and lipids were measured. Additional data were retrieved from the blood bank information system. Mean differences and odds ratios were calculated with 95% confidence intervals. RESULTS: Cases had a less favorable cardiovascular profile compared to control subjects. The usual intake of fat was not associated with turbid plasma donation. In a multivariate model, having dinner before donation (OR, 4.9; 95% CI, 2.2‐11.1), triglyceride levels (OR, 7.1; 95% CI, 4.6‐10.8), and smoking (OR_{yes vs. no}, 2.5; 95% CI, 0.9‐6.7; and OR_{ever vs. no}, 5.7; 95% CI, 1.8‐18.4) were associated with an increased risk. Opacity was clearly increased in turbid plasma. Total cholesterol levels were 0.51 (95% CI, 0.35‐0.66) mmol/L and triglyceride levels 4.28 (95% CI, 3.92‐4.68) mmol/L higher in cases. High‐density lipoprotein cholesterol levels were 0.34 (95% CI, ?0.39 to ?0.30) mmol/L lower. Forty‐two percent of all cases had very high triglyceride levels (≥5.65 mmol/L) compared to less than 1% of control subjects. CONCLUSION: Donors who provided a turbid donation have a less favorable cardiovascular profile compared to other donors. Having dinner, high triglyceride levels, and smoking are independent risk factors for turbid plasma donations.