TY  - RPRT
TI  - Letter: Widal tests for water workers.
AU  - A F Rahman
AU  - M E Cowan
PY  - 1974
DO  - 10.1136/bmj.2.5910.121
UR  - https://pubmed.ncbi.nlm.nih.gov/4824937/
ID  - 4824937
ER  -