system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 what the common cold would do if I had no immune system response to it.

If the cold symptoms we feel are the body's response to infection, what does the infection do if it faces no resistance? If it kills us, how?

I recognize that if I had no immune system respose, lots of things other would kill me. How would the common cold specifically do it is my question. Thank you!
gpt
The common cold is caused by any of up to 200 viruses (not bacteria).  If you could not get rid of it because you lack a functioning immune system, complications that exist even for those with a functional immune system, such as pneumonia, would be more likely to occur.