iPads work with standard mice, and have an on-screen mouse pointer. I used mine with an old mouse I had lying around a couple of weeks ago. Works fine.
iPad OS does have mouse support actually. I'm really not sure why they haven't made it possible to develop on iPads yet, I know I would get a 13 inch iPad Pro in a heartbeat if I could develop on it and sideload apps onto it.
High volumes of travelers siphoning through the same paths, touching the same surfaces, interacting with the same service personnel.
Those travelers being from all-over, thus introducing new region-to-region microbiota mixes. Those travelers often tired or dehydrated from long plane travel across time-zones.
Even a heavily-trafficked park, grocery store, or DMV-like public service outlet might not face the same volume of widely-exposed & weary people as an airport does.