Bloody needles

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Abstract
Residual HIV-infected blood in needles and syringes is a source of HIV infection. Using radiolabelled blood we have simulated needlestick injuries and sharing of syringes by intravenous drug users and quantified the volumes of blood which could be transferred to recipients in these situations. Up to 0.75 μl of blood was transferred in needlestick simulations, but there was a large variation. In simulations of needlesharing, seven to ten times more blood was transferred from the index user to the first sharer when 2 ml syringes were used compared with 1 ml syringes. Washing with water was not effective in removing ‘infected’ blood from a syringe.

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