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I don't think working in the cold causes one to get sick but it might make one more susceptible to getting sick. It may lower ones immune system by reducing the blood flow which reduces the supply of white blood cells to parts of the body. Also cold air may be more likely to dry the mucus membranes lining the airways causing them to be more exposed to any germs that are present. Dressing warmly and hydrating though would probably help counter these things.
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