Research Article
Household Transmission of SARS-CoV-2 in Bhutan
Table 2
Characteristics of secondary transmission of COVID-19 in households.
| Characteristics | Household contacts () | Positive household contacts () | Secondary attack rate (%) | 95% CI |
| Characteristics of household contacts | | | | | Age | | | | | <18 years | 123 | 78 | 63.4 | (54.5-71.5) | ≥18 years | 183 | 102 | 55.7 | | 18-44 years | 146 | 78 | 53.4 | (44.1-61.4) | 45-59 years | 23 | 16 | 69.6 | (47.9-85) | ≥60 years | 14 | 8 | 57.1 | (30.7-80.1) | Sex | | | | | Male | 131 | 78 | 59.5 | (50.9-67.7) | Female | 175 | 102 | 58.3 | (50.8-65.4) | Relationship to the index case | | | | | Spouse | 47 | 26 | 55.3 | (40.9-68.9) | Siblings | 39 | 16 | 41 | (26.7-57.1) | Child | 99 | 72 | 72.7 | (63.1-80.6) | Parents | 28 | 15 | 53.6 | (35.1-71.1) | Relatives (grandparents, cousins, others) | 47 | 22 | 46.8 | (33-61.1) | Friend/neighbor | 39 | 26 | 66.7 | (50.4-79.7) | Employee | 7 | 3 | 42.9 | (12.9-79.2) | Clinical status | | | | | Symptomatic | 105 | 104 | 99 | (93.4-99.9) | Asymptomatic | 201 | 76 | 37.8 | (31.3-44.8) | Symptom status | | | | | Mild | 102 | 101 | 99 | (93.2-99.9) | Moderate | 3 | 3 | 100 | — | Comorbid | | | | | Yes | 17 | 10 | 58.8 | (34.5-79.5) | No | 289 | 170 | 58.8 | (53-64.4) | Vaccination | | | | | Yes | 179 | 99 | 55.3 | (47.9-62.5) | No | 127 | 81 | 63.8 | (55-71.7) | Vaccination (≥18 years of age) | | | | | Yes | 178 | 98 | 55.1 | (47.6-62.3) | No | 5 | 4 | 80 | (25.3-97.9) | Doses | | | | | 1 dose | 179 | 99 | 55.3 | (47.9-62.5) | Past COVID infection | | | | | Yes | 1 | 0 | 0 | — | No | 305 | 180 | 59 | (53.4-64.4) | Characteristics of index case | | | | | Age of index case | | | | | <18 years | 39 | 13 | 33.3 | (20.3-49.6) | ≥18 years | 267 | 167 | 62.5 | (56.6-68.2) | Index case sex | | | | | Male | 156 | 91 | 58.3 | (50.4-65.9) | Female | 150 | 89 | 59.3 | (51.2-67) | Symptom status of index case | | | | | Symptomatic index | 233 | 142 | 60.9 | (54.5-67) | Asymptomatic index | 73 | 38 | 52.1 | (40.6-63.3) | Vaccination status of index case | | | | | Yes | 257 | 167 | 65 | (58.9-70.6) | No | 49 | 13 | 26.5 | (16-40.7) |
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