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Cold, dry air increases susceptibility to viral and bacterial infections, while more humid and warm environments make the upper respiratory area more robust against infections.
Deliberate cold exposure can increase immune system markers and make one more resistant to infection through the release of adrenaline.
However, repeated exposure can cause reductions in immune cell efficiency.
Deliberate hyperventilation and cold exposure can enhance immune system function if done repeatedly, but too much can suppress it.
Resting when sick allows the body's resources to focus on fighting the infection.
Nasal breathing reduces the risk of infections entering through the mouth.
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