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TOXIC algae has been found in lakes at Haysden Country Park, Tonbridge, and nearby in the River Medway, downstream from the Leigh Flood Barrier.
It is thought to be the result of the exceptionally high temperatures and Tonbridge and Malling Borough Council has issued a warning.
Council spokeswoman Sally Hall said it was a form of naturally occurring blue-green algae which blooms in certain weather.
She said: "Although the algae is not always harmful, contact with it can cause illnesses including skin rashes, eye irritation, vomiting, diarrhoea, or fever and pains in muscles and joints.
"In some cases, these symptoms have been severe although there have been no reports of long-term effects or deaths in humans.
"Animals are also at risk, and they can suffer severe illness and even death if they come into contact with the algae."
As a precaution, clubs using the lakes have temporarily suspended activities. However, the council advises that Haysden Country Park and other open spaces along the river remain open and safe.
Visitors to the park or the affected part of the Medway are advised to avoid contact with the water. Dog owners should not allow their pets to drink from or swim in it.
The council and Environment Agency are monitoring the situation and warning notices have been put up.
Anyone who is concerned that they or a pet may be suffering side effects after coming into contact with the algae should contact their doctor or vet .
Further advice is available from the council's environmental health officer Andrew Martin, telephone 01732 876184 or e-mail: andrew.martin@tmbc.gov.uk