The book describers fungi, bacteria and viruses (as well as subviral pathogens) in light of recent information.  It introduces the three domains (=super kingdoms), the Archaea, bactria and Eukarya, proposed by Cari Woese,  and the new kingdoms of Protozoa, Chromista and Straminopila. The new classification of fungi (Kirk et al 2001),  bacteria (Bergeys Manual of Systematic bacteriology, 2004) and viruses (International Committee on Taxonomy Of  Viruses,2006) have been included. There are description as of Viroids, Virusoids, Virnose, and Prions -  organisms before which viruses pale into insignificance in smallness of their size and ingenuity of parasitism.  There is a separate chapter on AIDS and HIV. I am sure readers will appreciate these additions and derive much  value by the newer information about these organisms.