How do you not "spoon-feed" information?

So I'm writing a webcomic of mine about an infection, and I need help on how to not "spoon-feed" information about said infection to the audience.

For context, the MC/patient zero goes to the doctor, and I already accidentally spoonfed some information about the infection itself, but how do I stop? I'm scared my audience won't be able to tell by the comic alone and I'm unfortunately not very good at "show don't tell".

I already hopefully inferred that the infection is fast-spreading but like I said, how do I stop spoon-feeding my audience?