We suggest carrying a whistle in order to attract attention in an emergency. Anglers should be aware of the dangers of Weils Disease, which is transmitted through rats' urine on the bankside and at the water's edge. Cover any open cuts, however small, with waterproof dressings. Food must not be put on the ground and hands must be as clean as possible when eating and preparing food. Never put wet line in your mouth or trim knots with your teeth.
Most cases start with an influenza-like illness, which resolves in two to three weeks.
Common features are sudden onset of fever, intense headache, severe pains in calf and back muscles, red eyes and prostration. Some cases develop abdominal pains with diarrhoea and vomiting or meningitis. If these symptoms occur, consult a doctor immediately. In the case of severe rat infestation, it should be reported to the water owner. If waters are publicly owned, report to the Pest Control Services division of the Environmental Health Services at your local borough or district council.