[1] Derriford Hosp, Dept Cellular & Anat Pathol, Plymouth, Devon, England
[2] Derriford Hosp, Microbiol, Plymouth, Devon, England
[3] Publ Hlth England, Rare & Imported Pathogens Lab, Salisbury, Wilts, England
[4] Royal Devon & Exeter Fdn Trust Hosp, Dept Neurol, Exeter, Devon, England