Figure 1. Coronavirus disease (COVID-19) incidence and anxiety level by report date from survey of psychobehavioral responses to the COVID-19 pandemic, showing timeline of major interventions, Hong Kong, 2020. A, school closures: A1, closure, Jan 25–May 26; A2, early start of summer holiday, Jul 13–Sep 22. B, government work-from-home arrangement: B1, Jan 29–Mar 1; B2, Mar 23–May 3; B3, Jul 20–Aug 23. C, group size limits on gatherings in public places: C1, limit 4, Mar 29–May 7; C2, limit 8s, May 8–Jun 18; C3, limit 50, Jun 19–Jul 14; C4, limit 4, Jul 15–Jul 28; C5, limit 2, Jul 29–Sep 10; C6, limit 4 persons, Sep 11–present. D, compulsory mask wearing: D1, on public transportation, Jul 15–present; D2, also in public indoor areas, Jul 23–present; D3, also in public outdoor areas, Jul 29–present (exemption for country parks or when engaging in strenuous physical activities in public outdoor spaces, Aug 28–present). E, regulations applied to restaurants, Mar 28–present: <50% of premises capacity; tables >1.5 m apart; no more than 2, 4, or 8 persons per table; compulsory mask wearing except when consuming food or drink; compulsory body temperature screening before entry; hand sanitizer on premises; suspension of dine-in service for the following periods: E1, 6 pm–4:59 am, Jul 15–Jul 28; E2, at all times, Jul 29–30; E3, 6 pm–4:59 am, Jul 31–Aug 27; E4, 9 pm–4:59 am, Aug 28–Sep 3; E5, 12 am–4:59 am, Sep 18–present. F, business closures: F1, bathhouses, party rooms, clubs, karaoke clubs, May 8–May 28; F2, bathhouses, party rooms, clubs, karaoke clubs (all reopened Sep 17), swimming pools (beginning Jul 29), sports premises (Jul 29–Aug 28), clubhouses (reopened Aug 28), beauty parlors (reopened Aug 28), massage establishments (reopened Sep 4), places of public entertainment (reopened Aug 28), places for amusement (reopened Sep 4), fitness centers (reopened Sep 4), and amusement game and mahjong-tin kau establishments (reopened Sep 11). G, vaccine development timeline: G1, World Health Organization (WHO) Convention of Global Research and Innovation, Feb 11–12; G2, WHO Global Research Roadmap prioritizing vaccine development, Jun 3; G3, draft landscape of candidate vaccines, Apr 11; G4, launch of COVID-19 Access Pool for sharing data for vaccine development, May 29; G5, funding commitment at Global Vaccine Summit for immunization in low-income countries, Jun 4; G6, call for USD 31.3 billion for therapeutics and vaccine development, Jun 26; G7, second summit on COVID-19 research and innovation, Jul 1–2; G8, engaging >150 countries in financing vaccines, Jul 15; G9, outline of global vaccine procurement, Aug 6; G10, WHO guidance on vaccine allocation between and within countries, Sep 14; G11, WHO calls for vaccine manufacturers to apply for prequalification, Oct 1. HADS-A, Hospital, Anxiety and Depression Scale—Anxiety.