Institution: | Cadi Ayyad University, Faculty of Sciences Semlalia, Department of Biology, PO Box S 15, Marrakesh, Morocco;Swedish University of Agricultural Sciences, Faculty of Veterinary Medicine, Section of Bacteriology, Biomedicum, Box 583, S-751 23 Uppsala, Sweden;Danish Veterinary Laboratory, Bülowsvej 27, DK-1790 Copenhagen V, Denmark;Microbiology and Tumor Biology Centre, Karolinska Institute, S-171 77 Stockholm, Sweden |