It is the most widely used vaccine worldwide, with more than 90% of all children being vaccinated. The immunity it induces decreases after about ten years. As tuberculosis is uncommon in most of Canada, the United Kingdom, and the United States, BCG is administered only to those people at high risk. Part of the reasoning against the use of the vaccine is that it makes the tuberculin skin test falsely positive, reducing the test's use in screening. A number of new vaccines are currently in development.
In addition to the U.S. and Canada, what European country sees very few tuberculosis infections?
the United Kingdom

Anglo-Saxons arrived as Roman power waned in the 5th century AD. Initially, their arrival seems to have been at the invitation of the Britons as mercenaries to repulse incursions by the Hiberni and Picts. In time, Anglo-Saxon demands on the British became so great that they came to culturally dominate the bulk of southern Great Britain, though recent genetic evidence suggests Britons still formed the bulk of the population. This dominance creating what is now England and leaving culturally British enclaves only in the north of what is now England, in Cornwall and what is now known as Wales. Ireland had been unaffected by the Romans except, significantly, having been Christianised, traditionally by the Romano-Briton, Saint Patrick. As Europe, including Britain, descended into turmoil following the collapse of Roman civilisation, an era known as the Dark Ages, Ireland entered a golden age and responded with missions (first to Great Britain and then to the continent), the founding of monasteries and universities. These were later joined by Anglo-Saxon missions of a similar nature.
Which people arrived in the British Isles when the Roman Empire's power was diminishing?
Anglo-Saxons

In The Use of Knowledge in Society (1945), Hayek argued that the price mechanism serves to share and synchronise local and personal knowledge, allowing society's members to achieve diverse, complicated ends through a principle of spontaneous self-organization. He contrasted the use of the price mechanism with central planning, arguing that the former allows for more rapid adaptation to changes in particular circumstances of time and place. Thus, he set the stage for Oliver Williamson's later contrast between markets and hierarchies as alternative co-ordination mechanisms for economic transactions. He used the term catallaxy to describe a "self-organizing system of voluntary co-operation". Hayek's research into this argument was specifically cited by the Nobel Committee in its press release awarding Hayek the Nobel prize.
The arguments presented in The Use of Knowledge in Society created an starting point for who?
Oliver Williamson