I told my husband we need to make sure to wipe down the airplane seats and tables and such. He told me I’m crazy...we flew before and didn’t wipe anything down and didn’t get sick. I’m also caught up on my immunizations but the pneumonia vaccine is iffy. One doctor says I’m within the 5 years another says I’m not...we actually were planning on a cruise but I backed out the last minute because I got super nervous about people getting sick around me. We also are renting a car since I didn’t want to be trapped on a bus with possibly sick people.
Thanks for your advice. A lot of people on Facebook are starting to post about them or their kids being ill so I’ve begun stocking up on more meds than I’d typically bring.
This is an article that talks about air travel:
https://www.usatoday.com/story/travel/flights/2014/10/13/airplane-germs/17044509/ Notice the info about HEPA air filters. I could find more technical articles detailing how nasty planes are, but that one is a nice summary.
I have had flight attendants tell me I'm doing the right thing. In fact, since I sit up front, I often see
them wiping down surfaces as well. If anyone knows, they do. If I'm not traveling with my husband, I tell my seat mate "I'm not a hypochondriac, I just take immunosuppressants", and they get it. Of course, if you rent a car, you'll want to do the same thing where you sit, but you only have to do it once.
And don't worry about your husband- it only takes seconds and costs mere pennies for you to take precautions. Tell him it could cost a lot more in wasted vacation time if you get sick,- been there and done that and I never want to do it again. And even if you don't get super sick, just a cold can turn a fun trip meh

Even though you have a GI problem, your medication makes you susceptible to all kinds of viruses and bacteria, not just the type that affects your intestinal tract.
My husband doesn't care (sometimes he'll take my little wipe and do his seat, too)

but by far the most important thing is hand washing, and using hand sanitizer all the time. Last time I picked a cold virus, I know for a fact I got it from shaking hands at church. I could have prevented that by using a hand sanitizer, but forgot. If you keep cleaning your hands, even if you touch something germy, you'll get rid of those germs!
Don't worry too much, and have a great trip!