No author listed. Communicable Diseases Intelligence volume 15 issue 10 - 20 May 1991 - whole issue. Commun Dis Intell (2018) [Internet]. 1991 May 20 [cited 2026 Apr. 14];15:166-7. Available from: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2916