Biological samples
LEH
BLOOD, POLIO, INFECTIOUS DISEASE
Blood and stool samples were temporarily stored at the Centre for the Evaluation of Vaccination (CEV) or in a central biorepository at the Laboratory of Experimental Hematology (LEH), Vaccine and Infectious Disease Institute, University of Antwerp after processing until they were shipped to the appropriate laboratories for analyses. Fresh whole blood was shipped to the Institute for Medical Immunology, Université Libre de Bruxelles (ULB, Brussels, Belgium) for determination of polio type-specific IgA/IgG ASC and ASC positive for the α