Volume 31, Number 10—October 2025
Research Letter
Crimean-Congo Hemorrhagic Fever Virus Circulation in Wild European Rabbits, Portugal, 2018−2023
Carolina Baptista
, Nuno Santos, Laurence Vial, and Ferran Jori
, Nuno Santos, Laurence Vial, and Ferran Jori
Table
Univariate analysis of binomial serologic results in study of Crimean-Congo hemorrhagic fever virus circulation in wild European rabbits, Portugal
| Category | Seropositive, no. | Sample size, no. | Prevalence, % (95% CI) | p value* |
|---|---|---|---|---|
| Sex | Referent | |||
| M | 1 | 260 | 0.37 (0.07–2.15) | |
| F | 2 | 289 | 0.71 (0.21–2.76) | |
| Unknown |
1 |
122 |
0.82 (0.14–4.50) |
|
| Age | 0.041 | |||
| Adult | 0 | 326 | 0 (0–1.16) | |
| Subadult | 0 | 104 | 0 (0–3.56) | |
| Juvenile | 3 | 127 | 2.36 (0.81–6.72) | |
| Unknown |
1 |
110 |
0.90 (0.16–4.97) |
|
| Year | 0.743 | |||
| 2018 | 0 | 60 | 0 (0–6.02) | |
| 2019 | 0 | 51 | 0 (0–7.00) | |
| 2020 | 0 | 59 | 0 (0–6.11) | |
| 2021 | 0 | 127 | 0 (0–2.94) | |
| 2022 | 3 | 195 | 1.54 (0.52–4.42) | |
| 2023 |
1 |
175 |
0.57 (0.10–3.17) |
|
| Month of sample collection | 0.519 | |||
| Jan–Apr | 0 | 45 | 0 (0–7.87) | |
| May–Aug | 3 | 299 | 1.00 (0.34–2.91) | |
| Sep–Dec | 1 | 314 | 0.31 (0.06–1.78) | |
| Unknown | 0 | 9 | 0 (0–29.91) |
*By Fisher exact test. Bold indicates significance (p<0.05).
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