Summer is the peak season for diseases cause by organisms that thrive in ponds, streams and marshes. Heather Smith Thomas shares prevention ideas. This is good information for anyone working with horse owners.
Source: Equus, July 2016 page 38. (link unavailable)
There’s no reason not to enjoy local rivers and lakes as long as the right precautions are taken. Both people and horses alike enjoy splashing in cold water in the summer.