In 1958 the American Association of Poison Control Centers (AAPCC) was founded to promote cooperation between poison centers in different cities and to standardize the operation of these centers. An additional part of the AAPCC's activities was poison prevention and education programs for both physicians and the general public. In 1968 the American Academy of Clinical Toxicologists (AACT) was established by a group of medical doctors. The AACT's main objective was to apply principles of toxicology to patient treatment and improve the standard of care on a national basis. In the 1960s and 1970s a rapid proliferation of poison centers emerged and by 1978 there were 661 centers in the USA. This trend reversed during the 1980s and 1990s with a number of centers closing or merging. In 2000 there were 51 certified centers in the USA. Today there are 55 centers operating in the US.