Table 1.
Characteristics of odour samples used for dog testing
| Infected group (RT-PCR +ve, n = 200) | Uninfected group (RT-PCR −ve, n = 200) | |
|---|---|---|
| Source of sample | ||
| Arctech Innovation/LSHTM call centre and Agile Lighthouse | 175 (87.5%) | 9 (4.5%) |
| NHS hospitals | 25 (12.5%) | 191 (95.5%) |
| Gender | ||
| Women | 147 (73.5%) | 155 (77.5%) |
| Men | 53 (26.5%) | 45 (22.5%) |
| Age, years | ||
| 16–50 | 129 (64.5%) | 117 (58.5%) |
| >50 | 71 (35.5%) | 83 (41.5%) |
| Ethnicity | ||
| White | 190 (95.0%) | 172 (86.0%) |
| Asian | 6 (3.0%) | 4 (2.0%) |
| Black | 1 (0.5%) | 1 (0.5%) |
| Other | 3 (1.5%) | 3 (1.5%) |
| Unknown | 0 (0.0%) | 20 (10.0%) |
| Symptoms at enrolment | ||
| Classic SARS-CoV-2 | 148 (74.0%) | 41 (20.5%) |
| Non-classic SARS-CoV-2 | 52 (26.0%) | 159 (79.5%) |
| Hospital patients | 0 (0.0%) | 0 (0.0%) |
| Symptoms at sample receipt at site | ||
| Classic SARS-CoV-2 | 80 (40.0%) | 11 (5.5%) |
| Non-classic SARS-CoV-2 | 76 (38.0%) | 168 (84.0%) |
| Unknown | 44 (22.0%) | 21 (10.5%) |
| Symptoms after 14 days | ||
| Classic SARS-CoV-2 | 65 (32.5%) | 3 (1.5%) |
| Non-classic SARS-CoV-2 | 121 (60.5%) | 191 (95.5%) |
| Unknown | 14 (7.0%) | 6 (3.0%) |
Symptoms at enrolment, at sample receipt at site and 14-day follow-up were categorised as ‘classic SARS-CoV-2’ if fever, cough, or loss or change of smell or taste were reported, and ‘non-classic SARS-CoV-2’ for those who reported no symptoms or where other symptoms were reported, including, shortness of breath, abdominal pain, muscle and joint pain, conjunctivitis or nausea. NHS hospitals: BHAM (1 uninfected), BSDN (1 infected, 12 uninfected), BUCK (47 uninfected), CAWH (9 uninfected), DBTH (14 infected, 4 uninfected), GETH (1 uninfected), JUHL (3 uninfected), KETG (1 infected, 15 uninfected), KMSF (6 uninfected), MACH (2 infected, 1 uninfected), MCRI (1 infected, 8 uninfected), MGPH (18 uninfected), MYSH (29 uninfected), PGHL (3 infected, 1 uninfected), UCLH (2 infected, 2 uninfected), UHCW (1 infected, 4 uninfected), UHMB (16 uninfected), WHAD (14 uninfected). All swabs were processed through routine NHS channels, apart from 1 positive, which were carried out through non-NHS testing route (private hospital)