No author listed. Communicable Diseases Intelligence volume 15 issue 14 - 15 July 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 Jul. 15 [cited 2026 Apr. 15];15:227-42. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2921