Blood samples from 186 HBsAg-positive Saudis and 42 HBsAg-positive Philippino blood donors were tested for anti-delta using the radioimmunoassay technique. The high prevalence of anti-delta in Saudis with liver disease (32%) contrasted sharply with that in Saudis with illness other than liver disease (13%) and in apparently healthy Saudis (5.4%). Together with the high prevalence of anti-delta in Philippino blood donors (9.5%), these results suggest that foci of endemic delta infection other than Italy probably exist.
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Ramia et al. (1987) studied this question.
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