2011-2013  
  Experiments performed in the laboratory of Parasitology, University of Marburg (Germany)  
  2 x 1 week  
  Collaboration with Emmanuel Cornillot and Ralph T. Schwarz  
     
  2007-2008  
  Experiments performed in the Unit of Structural and Functional Glycobiology, University of Lille (France)  
  4 x 1 week  
  Collaboration with Elisabeth Elass and Yann Guérardel  
     
  Experiments performed at the Institute for Microbiology and Hygiene, University of Berlin (Germany)  
  3 x 1 week  
  Collaboration with Oliver Liesenfeld  
     
  2005-2006  
  Experiments performed at the Institute for Medical Microbiology, University of Göttingen (germany)  
  6 x 1 week  
  Collaboration with Carsten Lüder  
     
  2004-2005  
  Experiments performed at the René Rachou Institute, Oswaldo Cruz Foundation, Belo Horizonte (Brazil)  
  3 x 2 weeks  
  Collaboration with Ricardo T. Gazzinelli  
     
  2001  
  Experiments performed in the laboratory of malaria immunology, WEHI, Melbourne (Australia)  
  3 weeks  
  Collaboration with Louis Schofield