You can exist long enough to catch a virus, be injured and get an infection, etc. I'm sure ingesting some things will make you sick, like taking antibodies when you aren't ill.
Getting a bad sunburn can do the trick too.
Why do you ask?
If you're wanting to make yourself sick purposely I'd strongly recommend you don't. It could have disastrous results.
No. Fever is not something you can catch. You can only develop a fever yourself in response to something going on inside of your own body.
Only if you have a mild infection.
tuculosis
nightquil
it was mild
Usually fever is more of a symptom of an underlying disease or infection.
it was very mild and contagious
Unless you live in a sterile environment, it is not likely you can keep yourself from sickness and fever.
One can take a pain killer(analgesics) for fever. Paracetamol can serve the purpose for mild fever. Combiflam is stronger drug and can treat severe fever.
Working out won't cause fever blisters.
No, typhoid fever can cause death though.
No, but fever can cause fatigue. Fevers are caused by infections.