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Testing donor blood for bacteria. Donor blood sample bottles being filled by a laboratory worker so that the blood can be tested for bacteria. The caps of the bottles, and the valve system of the blood bags, ensure sterility is maintained. The bottles are labelled and the blood is tested for bacteria and other micro-organisms. Many diseases can be transmitted by infected blood, including hepatitis and AIDS. Contamination of donor blood with bacteria can lead to blood poisoning.
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