I belive the answer is a sand bar!
I see pictures above , what do you exactly need help with?
Answer:
No this is not an outbreak
Explanation:
No it cannot be classified as outbreak because an outbreak is when the number of affected individuals in an epidemic is much higher as compared to the estimated values. However, an epidemic is the one that affects the people around different countries of the globe.
This can be considered as endemic that is restricted to a certain set of people in a community
I would have studied pattern of movement of affected kids. The common pool to which all these kids visited can be the infectious one. Also one can test the pathogen in infected kinds, and look for similar pathogen in pool water through testing.