Health Ministry director-general Dr Noor Hisham Abdullah has expressed concern over sporadic Covid-19 cases, particularly in the Klang Valley, and urged people to be consistent in taking precautions against the disease and following the government’s standard operating procedures.

He said after the third movement control order was implemented on May 12 and the total lockdown beginning June 1, the rising number of cases in Covid-19 clusters have been contained since last week.

However...