1. Clinical Microbiology and Infectious Medicine, Department of Medical Sciences, Uppsala University, Uppsala, Sweden.
2. Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden.
3. Centre for Communicable Diseases, International Centre for Diarrhoeal Disease Research, Bangladesh (ICDDR, B), Dhaka, Bangladesh.
4. Section for Zoonotic Ecology and Epidemiology, School of Natural Sciences, Linnaeus University, Kalmar, Sweden.