Five ways to spread germs......
Herd many people into unaturally small space (departure lounges are ideal)
Deprive them of fresh air and daylight
Put them under stress
Lock them in an airtight aluminium tube for several hours
Circulate droplet infections with airconditioning
Bingo.
If ya' think antiseptic wipes, treating water, masks (they are effective for about 2 minutes) etc will make a difference, then do it.