Highly individual patterns of virus-immune IgG effector responses in humans.

"Conflict of interest The authors have declared that no competing interests exist. The founding sponsors had no role in the design of the study; in the collection, analyses or interpretation of data; in the writing of the manuscript; and in the decision to publish the results."

"We thank G. Ebers (Biotest, Dreieich, Germany) for IVIG. The expert technical assistance of A. Voges, I. Deitemeier and M. Thieme is gratefully acknowledged. We thank Vu Thuy Khanh Le-Trilling (Institute for Virology, University Hospital Essen, University of Duisburg-Essen) for critically reading the manuscript. This work was supported by funds of the Deutsche Forschungsgemeinschaft through He 2526/6-2, GK1045, the Helmholtz Association through VISTRIE VH-VI-242 and the European Commission through QLRT-2001-01112 and MRTN-CT-2005-019248. ECA was supported by the German Academic Exchange Service (DAAD) and the University of Costa Rica. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript."