The participants exposed to a cold virus with a lower risk of developing a cold were less stressed and more positive at the beginning of the study.
Your immune system may become weakened if your cortisol levels remain high for an extended period of time as a result of stress. Stress can also cause harm to your body's own cells and even cause immune system reactions, such as increased inflammation, which can leave you more vulnerable to illnesses and viruses. The immune system is suppressed by raising catecholamine and suppressor T cell levels.
Hence, stress weaken body capability to fight infection.
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