Annual report on entomological surveillance in Spain. Results of the 2022 campaign (Ministry of Health)

January 15, 2024

Since 2016, entomological surveillance procedures and protocols available in Spain have been assessed annually. This process involves sending an entomological questionnaire to all public health departments of the various Autonomous Communities and Cities (CC.AA.) responsible for environmental health.

The entomological questionnaire was updated in April 2023 to adjust its structure to include questions related to the expanded content of the new Health and Environment Strategic Plan 2022-2026.

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Some relevant tables and maps from this report

Cases of dengue, Zika, chikungunya and yellow fever detected in 2022.

Using the entomological questionnaire, 229 imported dengue cases, two suspected autochthonous dengue cases, six imported Zika cases, and six imported Chinkungunya cases were reported. There were no imported or indigenous cases of yellow fever, and no indigenous cases of Zika or chikungunya. (All figures given correspond to cases confirmed by laboratory diagnostics) Some CC. AA. reported additional cases identified as probable or suspected, including five suspected cases of imported dengue and one suspected case of imported chikungunya in Andalusia, six suspected cases and four probable cases of imported dengue in the Canary Islands, and eighteen suspected cases of imported dengue in Catalonia.

Cases detected during the period of viremia were found in a municipality with the presence of a competent vector in Andalusia, Catalonia, the Valencian Community, the Balearic Islands and the Basque Country. In particular, spatiotemporal overlap was observed in twelve Andalusian municipalities, the total number of municipalities of Valencia, three municipalities of the Balearic Islands and six Basque municipalities where cases were reported.

Cases of West Nile fever, Usutu fever and Rift Valley fever identified in 2022.

Of the total, two are SS. AA. (Andalusia and Catalonia) each reported two human cases of indigenous West Nile fever (WNV) in 2022, for a total of four cases. In both SCs. AA. autochthonous transmission is suspected. In addition to the four confirmed local cases of WNV, one probable case of imported WNV was identified in Andalusia. Similarly, WNV infection was detected in seven animals in Catalonia (six goshawks and one horse), in a horse from Cádiz in Madrid, and in two birds in the far south of Castile and León (a goshawk and a griffon vulture). .

Cases detected during the viremic period were reported in a municipality with the presence of a competent vector in Andalusia and Catalonia. In particular, in the municipalities of Vejer de la Frontera (Cádiz), Montalbán de Córdoba (Córdoba) and Reus (Tarragona), cases of diseases were identified in people with spatiotemporal overlap Culex competent. In both Andalusian municipalities, the presence of the vector was confirmed by capturing adults, which determined high and low-medium vector densities, respectively. In the municipality of Reus, the vector has been widespread for many years.

Some detection maps of Aedes spp. and Culex spp.

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