Fig. 1.

Recruitment procedure of study participants.

Between 28.02.2020 and 04.04.2020, 223 SARS-CoV-2 cases were identified amongst 3319 SARS-CoV-2 suspected cases that were RT-PCR-tested (1.1% of population tested), out of which 194 were included in the study. There were 245 eligible household members, out of which 148 were included. In households with more than one case, 31 non-primary cases were redefined as household members, giving a total of 179 household members. Possible household clusters of six or nine co-primary cases had symptom onset within 24 or 48 h, respectively, after symptom onset in the index patient. Forty household members did not consent, 3 of whom were RT-PCR positive, 18 were children under 10 years old and 12 were under 20 years old. In total, we included 291 people comprising 112 index patients living with others and their 179 household members. Fifty-one cases were not included in the analyses as they lived alone or were defined as single-person households because they did not have household members who wished to participate in the study.