1. Department of Immunology; Aggeu Magalhães Research Centre, Oswaldo Cruz Foundation; Recife PE Brazil
2. Department of Veterinary Medicine; University of Bari; Valenzano Bari Italy
3. Department of Disease Control, Faculty of Infectious Diseases; London School of Hygiene and Tropical Medicine; London U.K.
4. Lethbridge Research Centre, Agriculture and Agri-Food Canada; Lethbridge AB Canada