When collecting human material for medical tests it is essential that only the material to be tested is tested, and that no contamination by other substances takes place. Swabs are used for collecting human material, and are guaranteed sterile when packed, so that when they are unpacked, there is no 'contaminating' material present on them. This makes them fully reliable. The buds are fitted to plastic or aluminum rods, and are made of rayon. If required, an agent can be added (with or without carbon). Swabs can be supplied in a peel-pack or in an unbreakable tube.
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