No author listed. Communicable Diseases Intelligence volume 15 issue 17 - 26 August 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Aug. 26 [cited 2026 Apr. 24];15:283-308. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2925