[1] Green Lane Hosp, Dept Clin Microbiol, Clin Microbiol Lab, Auckland 3, New Zealand
[2] Auckland Hosp, Dept Infect Dis, Auckland, New Zealand
[3] Auckland Hosp, Dept Clin Microbiol, Auckland, New Zealand
[4] Middlemore Hosp, Dept Clin Microbiol, Auckland 6, New Zealand
[5] N Shore Hosp, Microbiol Lab, Auckland, New Zealand
[6] Christchurch Hosp, Dept Infect Dis, Christchurch, New Zealand
[7] Christchurch Hosp, Dept Clin Microbiol, Christchurch, New Zealand