This filed of study is growing rapidly after a somewhat slow start over recent decades. This collection of invited chapters attempts to reflect current research, and brings together cell biologists, microbiologists and immunologists with disparate interests. However, there is a certain unity, even repetition of key themes, hopefully like a symphony rather than a boring catalogue. It will be evident that editorial bias favors intracellular paratism and medically important organisms. The neutrophil is far more than a supporting player to the macrophage, and some attempt is made to remind the reader of some of its unique skills. To retain a manageable size, the emphasis is on relatively early events such as mutual recognition, cell entry, and response, rather than on longterm changes in gene expression by either host cell or pathogen. Viruses are excluded not because of lack of importance but because of somewhat different research approaches, although it is cytogenes, share common strategies in invasion and intercellular spread.