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Mmmm some confusion methinks. Firstly humans are warm blooded. The proper term is homoiothermic; this means that we regulate our body temperature to a constant 37 deg.C. So going out in the cold will not change your internal body temperature or that of the cells in which your immune system is fighting the cold virus. Also getting a cold virus does not "compromise the immune system" though it may tax it somewhat, (hence the increased temperature and fever). It is much more likely that the secondary bacterial infection to which we are prone when we get a cold virus may be more rampant if we waste our energy on maintaining body temperature, (when we go out in the cold weather), than on fighting the infection.
...Present scientific opinion dismisses any cause-and-effect relationship between acute cooling of the body surface and common cold.