this part is interesting :-
Close contacts were defined as persons who were within 2 meters of the patient for >30 minutes or had physical contact with him or had physical contact with surfaces or materials contaminated by secretions from him from April 30 on (11).
We identified 23 close contacts (19 workshop attendees and 4 hotel staff) and 8 lower risk contacts. Quarantine orders were issued to 22 close contacts on May 9; they were required to remain at home or at a government quarantine facility for the duration of the remaining incubation period (21 days). They were not allowed to come into physical contact with others on the same premises and were monitored for fever and rash >3 times each day through video calls. One close contact, who was well, had left Singapore for Nigeria on May 5; we provided details to the Nigerian International Health Regulations National Focal Point.
Close contacts were offered smallpox vaccination (ACAM2000; Sanofi Pasteur Biologics Co, https://www.sanofi.com) as postexposure prophylaxis. Of the 22 close contacts, 14 received the vaccination, 2 had contraindications, and 6 declined. All vaccinated persons had a scab or ulcer at day 6–8 of review. Side effects included slight fever and mild swelling at the vaccination site; no serious adverse events were reported. Lower risk contacts were placed on phone surveillance twice a day for the remaining incubation period.
