Workshop on Extracellular virulence factors of Pseudomonas aeruginosa, Gregynog Hall, University of Wales, 15-17 September 1986 Brief correspondence regarding arrangements; programme; manuscript notes. Clarke chaired the second session on Structural aspects of pathogenity - the organism. She contributed to the planned volume arising from the meeting, see CLARKE/C/1 and CLARKE/C/2 for further papers 1985-1986