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They're saying that as many as a few dozen have tested positive, and employees said it was common to reuse all syringes.
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That in and of itself doen't mean that was the source of contamination. The article glossed right over the probable real cause, not cleaning the scope equiptment properly.
Not too suprising though. Everyone is afraid of needles. Easier villan for the story.
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You put in the catheter (basically a plastic tube) with a needle, and connect it to the IV tubing to the bags of solution you're infusing the patient with. There is always a flashback of blood (if you do it right, that is) when you first stick the pt, and to make sure your IV hasn't fallen out of place, you drop the IV bag to see if the blood comes back down the tube.
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Dropping the bag down is completely unnecessary. If you get in the vein, there will be a good flashback in the IV needle. When the needle gets retracted blood will come pouring out if you don't have pressure on the vein while you hook up the IV tubing.