I have seen Fire Ants at the resorts and on WDW property but I have not seen the nest in the parks. I grew up in FLA, so looking for Fire Ant Nest is something you learn to do without thinking.
If you have an emergency at WDW call 911. If you see a CM ,tell them to call 911.
Long story I will keep short. Last year we were at EPCOT for F&W and saw a lady pass out on the main walkway to WS. She was an Epileptic and I think she felt a seizure coming since she tried to get to one of the concrete benches. She was lucky when she went down because she easily could have hit her head on a concrete planter, the concrete bench, or the concrete pavement.
I and two ladies saw her go down. The lady was having a seizure. I told the DW to call 911 but then we both saw a CM who called in the emergency. I have a voice that travels,

, and when I saw the lady go down, I moved rapidly away from the DW. DW was a good distance from me when I told her to dial 911. Quite a few people heard me tell her to dial 911.
The lady was not on the ground for more than 30 seconds before she had me, with first responder training and experience and THREE nurses helping her.
The Fire Department was on scene within five minutes. At that point her seizures had stopped and she was starting to regain consciousness.
From her ID the lady was likely at a get together of other Disney Fans from another website. I am pretty sure she used to be on the DISboards. The FD recognized her so I think she visits the parks regularly, and unfortunately, has frequent seizures.
The next day we returned to EPCOT at about the same time. As we got off the buses we saw Disney Security near the bathrooms and there was a person on the ground.

Yes, it was the same lady. I think she was trying to get a cab or a bus and felt the seizures starting. She tried to sit on the curb and went down. Her seizures were over by the time we saw her. The FD was on the way. I told Security that she had gone down yesterday at the same time
We have seen other people go down at WDW. Surprisingly at EPCOT as well.

Maybe we should stay away from EPCOT.

Security and CM's were on the scene quickly. We did not wait around but I am sure the FD was there fast.
Later,
Dan