ABSTRACT
Introduction ....................................................................................................................................445 Rickettsiaceae .....................................................................................................................446 Bartonellaceae ....................................................................................................................447 Anaplasmataceae ................................................................................................................448 Holosporaceae .....................................................................................................................448
Rickettsial Genotypic and Phenotypic Characteristics ..................................................................448 Rickettsial Virulence and Pathogenesis ......................................................................................... 450 Changing Ecology of Rickettsial Pathogens .................................................................................. 451 Rickettsial Pathogens as Biothreat Agents .................................................................................... 453 Acknowledgments .......................................................................................................................... 453 References ...................................................................................................................................... 453
