No author listed. Communicable Diseases Intelligence volume 15 issue 15 - 29 July 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Jul. 29 [cited 2026 Apr. 11];15:244-62. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2922