FS Yew, KT Goh, YS Lim - Epidemiology and infection, 1993 - pubmed.ncbi.nlm.nih.gov
A total of 1452 cases of typhoid fever was notified in Singapore from 1980-9. The morbidity
rates of indigenous cases showed a steady decline from 5.9 per 100,000 population in 1980 …