Normally, you get this via inhalation of contaminated dust/mist/water, or drinking contaminated water, or eating contaminated food.
The CDC ‘says’ (it’s always hit and miss with them)....that you just don’t see many cases where it goes person-to-person.
I’d be asking the people affected....who has served you food in the past week. I’d also be suspicious that it’s only a handful affected.
Also!