No author listed. Communicable Diseases Intelligence volume 15 issue 20 - 7 October 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Oct. 7 [cited 2026 Apr. 22];15:351-72. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2928