There's nothing specific about the deliberate cold exposure itself that can induce a cold or other type of infection. If you are feeling malaise, if you're feeling like you have to rest, you're tired, you're not feeling good because of a cold or because of a flu I would say stay out of deliberate cold exposure. There I would instead recommend warmer hot baths, warmer hot showers, the sauna, etc. And again, people use deliberate heat exposure because of the stress it induces. They're doing some heat induce, for instance, heat shock proteins and different ways of increasing heart rate. That's a different sort of thing.

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