1. Department of Veterinary Microbiology; Faculty of Veterinary Science; Chulalongkorn University; Bangkok Thailand
2. Institute of Veterinary Bacteriology; Vetsuisse Faculty; University of Bern; Bern Switzerland
3. Department of Microbiology; Faculty of Medicine; Siriraj Hospital; Mahidol University; Bangkok Thailand
4. Department of Microbiology; Faculty of Medicine; Chulalongkorn University; Bangkok Thailand