1. Faculdade de Ciências Farmacêuticas Universidade de São Paulo São Paulo Brazil
2. Departamento de Veterinária Universidade Federal de Viçosa Viçosa Brazil
3. Department of Biochemistry and Microbiology Faculty of Biology Plovdiv University Paisii Hilendarski Plovdiv Bulgaria
4. Department of General and Applied Microbiology Faculty of Biology Sofia University St. Kliment Ohridski Sofia Bulgaria
5. Laboratory of Virology Faculty of Biology Sofia University St. Kliment Ohridski Sofia Bulgaria
6. Institut National de la Recherche Agronomique UR 1268 Biopolymeres Interactions Assemblages Nantes cedex 3 France