No author listed. Communicable Diseases Intelligence volume 15 issue 19 - 23 September 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Sep. 23 [cited 2026 Apr. 22];15:327-49. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2927