From what i remember the amoeba is always in the water. It is more active in warmer water and when the water is warmer, swimmers are more plentiful. But getting a snoot full of amoeba is still a very rare occurrence which is why you hear about it on the news. From the last data that i have seen Florida averages around 465 drownings a year. That is double the national average. Drownings happen on a regular basis down here so it might make a little blurb on the local news, die by amoeba or alligator and it will make the national news because it doesn't happen often.