In the relatively short period since "Cryptosporidium" was recognised as a human pathogen, and that it could be transmitted in water as well as directly between animals and people, it has been the subject of intense investigations. Its status as an opportunistic pathogen, especially in AIDS patients, and the lack of effective anti-cryptosporidial drugs have served to emphasise the public health importance of this organism. This has to some extent overshadowed the fact that "Cryptosporidium "is also an important pathogen of domestic animals and wildlife.

In recent years, the application of molecular biology and culture techniques have had an enormous impact on our understanding of the aetiological agents of cryptosporidial infections and our ability to study the causative agents in the laboratory. As a consequence, a wealth of information and novel data has been produced during the last 3-4 years, particularly in the areas of taxonomy, biology, pathogenesis, epidemiology - particularly zoonotic and water borne transmission, and treatment.

It is thus very timely to bring together in this book the international research community involved to review the major advances in research and identify the important research priorities for the future, thus enabling as wide an audience as possible to benefit from and share in this comprehensive look at "Cryptosporidium "and cryptosporidiosis.

Short-listed for the 2012 Speaker's Book Award Edmund Zavitz (1875-1968) rescued Ontario from the ravages of increasingly more powerful floods, erosion, and deadly fires. Wastelands were talking over many hectares of once-flourishing farmlands and towns. Sites like the Oak Ridges Moraine were well on their way to becoming a dust bowl and all because of extensive deforestation. Zavitz held the positions of chief forester of Ontario, deputy minister of forests, and director of reforestation. His first pilot reforestation project was in 1905, and since then Zavitz has educated the public and politicians about the need to protect Ontario forests. By the mid-1940s, conservation authorities, provincial nurseries, forestry stations, and bylaws protecting trees were in place. Land was being restored. Just a month before his death, the one billionth tree was planted by Premier John Robarts. Some two billion more would follow. As a result of Zavitz's work, the Niagara Escarpment, once a wasteland, is now a UNESCO World Biosphere. Recognition of the ongoing need to plant trees to protect our future continues as the legacy of Edmund Zavitz.