1. National Infection Service, Public Health England, London, United Kingdom
2. Health Protection Scotland, Glasgow, United Kingdom
3. Cryptosporidium Reference Unit, Public Health Wales, Swansea, United Kingdom
4. PHE National Parasitology Reference Laboratory, Hospital for Tropical Diseases, London, United Kingdom
5. Scottish Parasite Diagnostic and Reference Laboratory, Glasgow, United Kingdom
6. Public Health Wales, Cardiff, United Kingdom
7. Public Health Agency of Canada, Ottawa, Canada