Frederick William Twort (1877-1950) was an English bacteriologist. He was born in Camberley, Surrey. He was the original discoverer in 1915 of bacteriophages, which are the relatively large viruses that attack and destroy bacteria. He studied medicine at St Thomas's Hospital, London, was superintendent of the Brown Institute for Animals (a pathology research centre), and he was also professor of bacteriology at the University of London. He researched into Johne's disease, a chronic intestinal infection of cattle, and also discovered that vitamin K is needed by growing leprosy bacteria. Camberley is a town in Surrey, England, situated less than twenty miles south-west of London, in the corridor between the M3 and M4 motorways. ... Surrey is a county in southern England, part of the South East England region and one of the Home Counties. ... ... Saint Thomas’ Hospital. ... London (pronounced ) is the capital city of England and of the United Kingdom. ... The University of London is a federation of colleges and institutes which together constitute one of the worlds largest universities. ... Johnes disease (pronounced yo-knees) is a contagious, chronic and usually fatal infection that affects primarily the small intestine of ruminants. ... Vitamin K denotes a group of 2-methilo-naphthoquinone derivatives. ... Leprosy, also known as Hansens disease, is an infectious disease caused by the Mycobacterium leprae bacterium that can lead to disfiguration of the body or skin. ...