I wonder if this will effect their business
Could be positive for business.
Who wants to take an STD home?
And if the girls are being responsible, getting tested regularly and acting upon it, then if there are a lot of STDs about, that's a lot of downtime for them, while they wait for it to clear up.
I think the sensible thing is go with the flow until the rate of infection drops back down.
Certainly there are adverts all,over London Underground about increase in STDs