1. Bacteriology Unit, Department of Infectious Disease Surveillance and Control, National Institute for Health and Welfare, Helsinki, Finland.
2. Laboratory of Molecular Biology, Epidemiology, and Bacteria and Virus Transmitted by Food, Research Centre of Biological and Food Sciences (CRSBAN)/Department of Biochemical-Microbiology, Research and Formation Unit of Live Sciences (UFR-SVT)/University of Ouagadougou, Ouagadougou, Burkina Faso.