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<p>Following the death of an 83-year-old man from the district of Bragança, in north-eastern Portugal due to Crimean–Congo hemorrhagic fever (CCHF), a serological survey was conducted to investigate domestic and wild ruminants. The survey included samples from cattle(<i>n</i> = 94), sheep(<i>n</i> = 30), goats(<i>n</i> = 4), and red deer(<i>n</i> = 10) collected within the affected region and neighboring areas where the human case was reported. CCHF antibodies were detected by ELISA in the serum of sheep, cattle and red deer, corresponding to seropositivity rates of 3.33%, 38.29%, and 60%, respectively, indicating significant exposure to the virus. Indirect immunofluorescence assays further validated the ELISA results. Most of the positive cattle originate from farms located in the Guarda district, which are located close to the Spanish border. None of the goats was positive for CCHFV-antibodies and viral-RNA was not detected in any of the samples. CCHFV-RNA was also not detected in 15 ticks from <i>Dermacentor</i> and <i>Rhipicephalus</i> genera collected from vegetation or cattle, on one of the positive farms. Our findings suggest that CCHFV is actively circulating in northeastern Portugal. Reports of human cases of CCHF in Spain, particularly near the border with Portugal, are consistent with the detection of CCHFV-RNA in ticks feeding on domestic and wild animals in western Spain, highlighting the potential for cross-border transmission and suggesting an established circulation of CCHFV in the Iberian Peninsula.</p>

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Evidence of Crimean–Congo hemorrhagic fever virus in livestock and wildlife in Northeastern Portugal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月11日

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  • Fábio Abade dos Santos,
  • Margarida D. Duarte,
  • António Caçote,
  • António Lourenço,
  • Diogo Maroco,
  • Ana Rita Varela,
  • Luís Bonifácio,
  • Miguel Pimpão,
  • Margarida Henriques,
  • Ana Duarte,
  • Sílvia C. Barros

摘要

Following the death of an 83-year-old man from the district of Bragança, in north-eastern Portugal due to Crimean–Congo hemorrhagic fever (CCHF), a serological survey was conducted to investigate domestic and wild ruminants. The survey included samples from cattle(n = 94), sheep(n = 30), goats(n = 4), and red deer(n = 10) collected within the affected region and neighboring areas where the human case was reported. CCHF antibodies were detected by ELISA in the serum of sheep, cattle and red deer, corresponding to seropositivity rates of 3.33%, 38.29%, and 60%, respectively, indicating significant exposure to the virus. Indirect immunofluorescence assays further validated the ELISA results. Most of the positive cattle originate from farms located in the Guarda district, which are located close to the Spanish border. None of the goats was positive for CCHFV-antibodies and viral-RNA was not detected in any of the samples. CCHFV-RNA was also not detected in 15 ticks from Dermacentor and Rhipicephalus genera collected from vegetation or cattle, on one of the positive farms. Our findings suggest that CCHFV is actively circulating in northeastern Portugal. Reports of human cases of CCHF in Spain, particularly near the border with Portugal, are consistent with the detection of CCHFV-RNA in ticks feeding on domestic and wild animals in western Spain, highlighting the potential for cross-border transmission and suggesting an established circulation of CCHFV in the Iberian Peninsula.