In 1998, Eastlund in a review article assessing 26 previous researches concluded that infectious diseases among donors who are recruited by monetary incentives are more prevalent.[ 31 ] A survey conducted by Retrovirus Epidemiology Donor Study (REDS) proved that donors who reported being encouraged to donate by cash incentive were 1.6 times more likely to be at risk for infectious diseases (OR = 1.56; 95% CI, 1.05-2.35).[ 33 ] Another study was carried out by European researches in 2002 to review studies published between 1968 and 2001, which evaluated a possible trend of change in the relative risk for infectious disease markers between paid and unpaid blood and plasma donors in the mentioned period.
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