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In page Contaminated blood scandal in Japan:

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As early as 1984, several Japanese haemophiliacs were discovered to have been infected with HIV through the use of untreated blood preparations; this fact was concealed from the public. The patients themselves continued to receive "intentional propaganda" which downplayed the risks of contracting HIV from blood products, assured their safety, and promoted their use. Of some 4500 haemophiliacs in Japan, an estimated 2000 contracted HIV in the 1980s from untreated blood preparations [J.E.N].[citation needed]