Table 1.
Attack rates by age and sex among enrolled calves tested at least once during the MERS-CoV outbreak period in Northern Kenya, 2019 (n = 162).
| Variable | Camels on Follow-Up during Outbreak Period ϕ (n = 162) | Swabs Collected (April–September 2019) (n = 1853) | Median Swabs per Calf (IQR) | PCR Positive (1st PCR Positive) n = 83 | Attack Rates ¶ % (95% CI) | p-Value |
|---|---|---|---|---|---|---|
| By Sex | ||||||
| Male | 86 (53.1%) | 963 (52.0%) | 14 (5–16) | 41 (49.4%) | 47.7% (36.8, 58.7) | Ref |
| Female | 76 (46.9%) | 890 (48.0%) | 14 (5–16) | 42 (50.6%) | 55.3% (43.4, 66.7) | 0.93 |
| By Age (in months) ƛ | ||||||
| 0–4 | 57 (35.2%) | 595 (32.1%) | 15 (5–16) | 24 (28.9%) | 42.1% (29.1, 55.9) | Ref |
| 5–12 | 20 (12.3%) | 285 (15.4%) | 16 (15–16) | 14 (16.9%) | 70.0% (45.7, 88.1) | 0.04 µ |
| 13–18 | 45 (27.8%) | 481 (26.0%) | 13 (5–15) | 22 (26.5%) | 48.9% (33.7, 64.2) | 0.49 |
| 19+ | 40 (24.7%) | 492 (26.6%) | 14 (11–15) | 23 (27.7%) | 57.5% (40.9, 72.9) | 0.14 |
| All calves | 162 (100.0%) | 1853 (100.0%) | 14 (5–16) | 83(100.0%) | 51.2% (43.3, 59.2) | NA |
ϕ 162 calves included in the analysis were sampled during the outbreak period (April–September 2019); ¶ Attack rates were computed for the first infections; ƛ Calf age as at end of March 2019; µ Fisher’s exact test (FET).