Table 2 Time periods considered for wild-type SARS-CoV-2 transmission during 2020 and Delta variant transmission during 2021
SARS-CoV-2 lineage | Time period | Description |
|---|---|---|
Wild-type | Jan 18–Feb 29, 2020 | Transmission driven by travellers arriving from Wuhan |
Mar 1–Apr 6, 2020 | Returning travellers from countries with ongoing outbreaks | |
Apr 7–Jun 18, 2020 | Increased reopening of national borders | |
Jun 19–Jul 12, 2020 | Resumption of more local activities | |
Jul 13–Dec 31, 2020 | Increased reopening of national borders | |
Delta variant | Apr 1–May 12, 2021 | Transmission driven mainly by travellers arriving from India |
May 13–Jun 20, 2021 | Tightening of outbreak control measures before relaxation of measures in mid-June | |
Jul 1–Jul 17, 2021 | Nightclub and fishery port outbreak clusters | |
Jul 18–Aug 18, 2021 | Tightening of outbreak control measures |