Topley and Wilson is used the world over as the definitive reference for microbiologists and infectious disease specialists. This 9th edition of Topley and Wilson builds on its undisputed reputation and boasts unparalleled coverage of the field of microbiology. To reflect the many changes and developments in this diverse field, the 9th edition is substantially reorganized. General principles, which were previously covered in a single separate volume, are now incorporated into relevant chapters throughout the volumes. Topics such as immune responses to viruses, bacteria and parasites are covered in the appropriate volumes. Organization of material within each volume is greatly improved, reflecting both the natural development of the subject as well as the needs of the modern microbiologists. Most of the material is completely re-written and deals with individual topics in greater depth. For the first time, coverage of mycology and parasitic protozoa is provided in two additional volumes, taking full account of their importance in public health. Geniunely comprehensive, there are more tables and illustrations than ever before, color photographs for the first time, as well as extensive referencing and a cumulative index in a separate sixth volume. Now available on CD-ROM, it offers additional features. Some of them are flexible searching by word or phrase, instant access to vast amounts of data, availability of relevant illustration by simply clicking on the text, and many more.