Food question: fully cooked sausage?

Walawala

My first appointment is next week so I haven't got a change to talk to my doctor. I'm going for a road trip this weekend and was wondering if it's okay for me to eat fully cooked sausage, prewashed and ready to eat veggie directly?

I read somewhere said even if the sausage is fully cooked, you still need to reheat it to steam hot to eat. Is that true?

Thank you all!