Given the high level of construction activity in Singapore, we have to keep a keen eye out for the spread of dengue and the Zika virus.
It may be hard to closely monitor what goes on at construction sites to ensure there are no mosquito breeding grounds ("Zika outbreak: Checks stepped up at construction sites"; Aug 31).
The need for personal physical checks ought to be supplemented with monitoring devices.
Heftier fines and other penalties such as halting construction work also need to be imposed.
Gan Kok Tiong