The emergence of the Delta variant and the presence of many asymptomatic individuals who are not aware of their infection and are spreading the coronavirus have resulted in the spike of Covid-19 cases in Greater Klang Valley (GKV).

Commander of the GKV Special Task Force Dr Chong Chee Kheong said despite the vaccination ramp-up, the number of daily new cases was still rising because the protection offered by the vaccine takes time to build.

“The vaccine effectiveness is best two weeks after the second dose, so...