system
Given the following post, respond as if you're commenting on Reddit:
human
Can people develop immunity to viruses after picking up the inactive virus from a surface?

If someone with a cold or other virus touches a shopping trolley and then I pick up that virus three days later when it has become inactive, would my immune system react to it?
Why does the immune system react to dead viruses from a vaccine?
gpt
Dead virus would not invade the body and so would not interact with the immune system, and being dead it would not trigger a response. Imagine what would happen if every bit of non-human protein resulted in immune activation. 

Dead virus vaccines work because they use adjuvants - substances known to set off alarm bells in the immune system.