Bath, Somerset Bath, Somerset Bath is the largest city in the ceremonial county of Somerset, England, known for its Roman-built baths. In 2011, the population was 88,859. Bath is in the valley of the River Avon, west of London and south-east of Bristol. The city became a World Heritage site in 1987. The city became a spa with the Latin name "" ("the waters of Sulis") 60 AD when the Romans built baths and a temple in the valley of the River Avon, although hot springs were known even before then. According to the Victorian churchman Edward Churton, during the Anglo-Saxon era
Aphanizomenon flos-aquae it had a profound effect on natural killer cells (NKCs). "A. flos-aquae" triggers the movement of 40% of the circulating NKCs from the blood to tissues. Some compressed tablets of powdered "A. flos-aquae" cyanobacteria (named as "blue green algae") have been sold as food supplements, notably those filtered from Upper Klamath Lake in Oregon. Aphanizomenon flos-aquae Aphanizomenon flos-aquae is a brackish and freshwater species of cyanobacteria found around the world, including the Baltic Sea and the Great Lakes. "Aphanizomenon flos-aquae" can form dense surface aggregations in freshwater (known as "cyanobacterial blooms"). These blooms occur in areas of high nutrient loading,