1 Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand. Electronic address: htin.aung@otago.ac.nz.
2 Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand.
3 School of Science, University of Waikato, Hamilton, New Zealand.