1 Medical Research Council Centre for Medical Mycology at the University of Aberdeen Aberdeen Fungal Group Institute of Medical Sciences Forester hill Aberdeen AB25 2ZD, UK. Electronic address: gordon.brown@abdn.ac.uk.
2 Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. Electronic address: R.C.May@bham.ac.uk.