Stung while in river

Hi Tom, Thanks for reply. It remains a mystery! I didn’t see anything. It was on the slow current side of the river but there is still a gentle current. The stings were instantaneous on my foot and slightly later on my leg, or the other way round! But definitely not individual bites unless there was a swarm of back swimmers? Never heard of them. Will look them up.  Thanks again. Sarah  

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