1. Danish Institute for Food and Veterinary Research, Søborg, Denmark;
2. Instituto Nacional de Enfermedades Infecciosas ANLIS “Carlos G. Malbran,” Buenos Aires, Argentina;
3. National Institute of Hygiene, Warsaw, Poland;
4. Chulalongkorn University, Bangkok, Thailand;
5. World Health Organization, Geneva, Switzerland;Institut Pasteur, Dakar, Senegal
6. World Health Organization, Geneva, Switzerland;Public Health Agency of Canada, Guelph, Ontario, Canada;
7. Centers for Disease Control and Prevention, Atlanta, Georgia, USA