Report on the 2013 Conference on “A World United Against Infectious Diseases: Cross-Sectoral Solutions”   Prince Mahidol Award Conference - January 28th – February 2nd 2013, Bangkok, Thailand   This One Health report is a welcomed addition to One Health literature over the last centuries.  Most discerning One Health leaders and supporters worldwide have recognized the important contributions and relevance of ecologists, wildlife biologists, and environmental scientists during the early 21st century.   NOTE:   Indeed, the 2004 Wildlife Conservation Society proposal of “One World One Health” was a significant early 21st century contribution that was shortly expanded upon by others and brought to a much higher profile in the U.S. and internationally.  The One Health (One Medicine) concept long predates the present post-1930s work of the Dutch biologist Nikolass Tinbergen and Austrian biologists Konrad Lorenz and Karle von Frisch (joint Nobel Prize winners in Physiology or Medicine-1973) which may be classified as the generation of modern ecologists and wildlife experts.  Many historical figures in the 19th and 20th centuries initiated One Health (One Medicine).  For some examples see