Yvonne Pannekoek received her M.Sc. in 1987 at the University of Amsterdam where she studied Biology with emphasis on Molecular Microbiology. She graduated in 1993, at the University of Amsterdam, Dept. of Medical Microbiology of the Academic Medical Center, thesis entitled “Identification of Neisserial stress proteins: Molecular and immunological properties of Neisserial Hsp60”. A part of her PhD work was carried out at the Max-Planck-Institut für Biologie, Abt. Infectionsbiologie, Tübingen, Germany, former laboratory of Prof. dr. Thomas F. Meyer were she worked as a visiting research fellow. After her graduation she joined the laboratory of Prof. dr. Patrik M. Bavoil, at that time situated in the University of Rochester, Dept. of Microbiology and Immunology, NY, US, where she worked as a postdoctoral fellow on the pathogenesis of Chlamydia infections. During that period she discovered the type III secretion system of Chlamydia. For this work she, together with other members of the Bavoil lab, received the best poster award during the Third European Chlamydia meeting that was held in 1996 in Vienna, Austria. In 1995 she returned to the Dept. of Medical Microbiology at the AMC in Amsterdam were she currently is appointed as Assistant Professor. Her main interests are the pathogenesis and molecular epidemiology of infections caused by N. meningitidis, S. pneumoniae, and Chlamydiae.