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In response to the continued increase in the number of high-quality papers submitted to the Journal from all parts of the world, we have again increased the number of published pages. The change to A4 format last year significantly increased the amount of material per page, and for 1992 the total number of pages was increased by 123% (96 additional pages in the course of the year). However, the flow of papers has outstripped even this planned increase. To deal with the developing backlog, and to avoid publication time becoming unacceptably long, we are making five issues (March-July) longer than average. The extent of each issue, for the remainder of 1992, will then revert to a lower level. In this way we intend to keep faith with our authors and subscribers in dealing with the short-term difficulty created by the Journal's success. A further increase in pages is planned for 1993. B. I. DUERDEN

Pertussis in adults: significance for disease transmission and immunisation policy