No author listed. Communicable Diseases Intelligence volume 15 issue 21 - 21 October 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Oct. 21 [cited 2026 Apr. 11];15:375-98. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2929