At the 2013 International Conference on Lyme Borreliosis and Other Tick-Borne Diseases in Boston, the Centers for Disease Control announced a new estimate of the number of cases of Lyme disease each year. Although previously estimated around 20-30,000 cases a year, it was well known that many cases were going unreported or even undiagnosed. The new estimate is 300,000 people infected per year in the US.