The Lancefield Society is an international association that brings together professionals in the field of streptococci and streptococcal diseases to raise awareness, promote scientific collaboration and research, and improve diagnosis, prevention and treatment. The Lancefield Society is not-for-profit and non-governmental. While it has its administrative headquarters in Melbourne, Australia, the Society is international in its scope, thinking and membership. The main activity of the Lancefield Society is the triennial Lancefield International Symposium on Streptococci and Streptoccocal Diseases (LISSSD), the premier event for clinicians, scientists and students engaged in the field of streptococci and streptococcal diseases research.