Pontiac fever outbreak associated with a spa-pool, United Kingdom, April 2008

On 16 April 2008, public health authorities in North West England were notified of six suspected cases of non-pulmonary legionellosis, five of whom were admitted to three different hospitals and one seen by a general practitioner. These cases presented with influenza-like symptoms: fever, headache, and muscle pain, with or without nausea. They were part of a group of seven women who had spent the weekend of 11-13 April at a residential leisure resort where they were using a spa pool (otherwise known as Jacuzzi or whirlpool).