SINGAPORE (The Straits Times/ANN): While the number of Covid-19 cases in the community has fallen in recent days, the number of unlinked cases has not come down, suggesting that there is a "larger, hidden reservoir" of cases, said Prime Minister Lee Hsien Loong on Tuesday (April 21).

https://www.thestar.com.my/news/regional/2020/04/22/singapore-concerned-over-039hidden-reservoir039-of-covid-19-cases