it makes me kind of paranoid about going in the water. I met a women once down in the riveria maya and she was so stung she had huge welts all over her body and was in severe pain when trying to use the bathroom. she was unable to put clothes on for the rest of her trip and the Drs there couldn't do anything for her. It freaked us out but seemed like a very rare thing. How common is it? We're going with 2 young kids at the end of this month which is my main concern.