[1] Inward Bound Ltd, Christchurch, New Zealand
[2] Univ London Queen Mary Coll, Barts, Ctr Infect Dis, London, England
[3] Univ London Queen Mary & Westfield Coll, London Sch Med & Dent, Ctr Infect Dis, London, England
[4] New Zealand Food Safety Author, Hamilton, New Zealand