{"id":138659,"date":"2025-11-19T22:16:32","date_gmt":"2025-11-19T21:16:32","guid":{"rendered":"https:\/\/lavozdeibiza.com\/sin-categorizar\/usutu-virus-what-is-it-how-is-it-transmitted-and-what-are-the-symptoms\/"},"modified":"2025-11-19T22:16:32","modified_gmt":"2025-11-19T21:16:32","slug":"usutu-virus-what-is-it-how-is-it-transmitted-and-what-are-the-symptoms","status":"publish","type":"post","link":"https:\/\/lavozdeibiza.com\/en\/baleares-en\/usutu-virus-what-is-it-how-is-it-transmitted-and-what-are-the-symptoms\/","title":{"rendered":"Usutu virus: what is it, how is it transmitted and what are the symptoms?"},"content":{"rendered":"<p data-start=\"1300\" data-end=\"1384\">The confirmation of the <a href=\"https:\/\/lavozdeibiza.com\/en\/current-news\/first-case-of-usutu-virus-detected-in-spain-in-a-blood-donor-in-the-balearic-islands\/\"><strong data-start=\"215\" data-end=\"266\">first autochthonous case of the Usutu virus in Spain, identified in a blood donation in Mallorca during the summer of 2024.<\/strong><\/a>virus, identified in a blood donation in Mallorca during the summer of 2024, has raised the alarm among public health specialists.<\/p>\n<p>The case was detected in a donor who had no symptoms and had not traveled outside the Balearic Islands, indicating the presence of the virus in the natural environment of the island. The first tests confused it with West Nile virus due to the genetic similarity between the two, but the analysis of the Instituto de Salud Carlos III allowed to identify precisely that it was the Usutu virus. <\/p>\n<h2 data-start=\"1300\" data-end=\"1384\"><strong data-start=\"1303\" data-end=\"1384\">What is Usutu virus and why is it related to West Nile virus?<\/strong><\/h2>\n<p data-start=\"1386\" data-end=\"1642\"><strong data-start=\"1389\" data-end=\"1404\">Usutu virus<\/strong> belongs to the flavivirus family, the same group as West Nile virus. Both share a high percentage of genetic similarity, which can lead to crossmatching results in screening tests. <\/p>\n<p data-start=\"1644\" data-end=\"1985\">Usutu has been documented mainly in birds, which act as a natural reservoir, while mosquitoes (especially those of the genus <em data-start=\"1788\" data-end=\"1795\">Culex)<\/em> are responsible for transmission. Although outbreaks in poultry have been reported in several European countries, human infections are rare and usually go unnoticed. <\/p>\n<h2 data-start=\"1992\" data-end=\"2031\"><strong data-start=\"1995\" data-end=\"2031\">How the Usutu virus is transmitted<br \/>\n<\/strong><\/h2>\n<figure id=\"attachment_138638\" aria-describedby=\"caption-attachment-138638\" style=\"width: 1012px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\" wp-image-138637\" src=\"https:\/\/lavozdeibiza.com\/wp-content\/uploads\/2025\/11\/Caso-autoctono-de-virus-Usutu.webp\" alt=\"\" width=\"1012\" height=\"570\" srcset=\"https:\/\/lavozdeibiza.com\/wp-content\/uploads\/2025\/11\/Caso-autoctono-de-virus-Usutu.webp 1920w, https:\/\/lavozdeibiza.com\/wp-content\/uploads\/2025\/11\/Caso-autoctono-de-virus-Usutu-300x169.webp 300w, https:\/\/lavozdeibiza.com\/wp-content\/uploads\/2025\/11\/Caso-autoctono-de-virus-Usutu-1280x720.webp 1280w, https:\/\/lavozdeibiza.com\/wp-content\/uploads\/2025\/11\/Caso-autoctono-de-virus-Usutu-768x432.webp 768w\" sizes=\"(max-width: 1012px) 100vw, 1012px\" \/><figcaption id=\"caption-attachment-138638\" class=\"wp-caption-text\">Autochthonous case of Usutu virus<\/figcaption><\/figure>\n<p data-start=\"2033\" data-end=\"2296\">The main transmission mechanism is the <strong data-start=\"2077\" data-end=\"2113\">bite of infected mosquitoes<\/strong>. These insects become infected when they feed on birds carrying the virus and can subsequently transmit it both to other birds and accidentally to humans. <\/p>\n<p data-start=\"2298\" data-end=\"2591\">So far, <strong data-start=\"2310\" data-end=\"2368\">there is no evidence of direct human-to-human transmission<\/strong>, either by air, physical contact or body fluids. For this reason, prevention measures are focused on controlling mosquito populations and monitoring virus circulation in wild birds. <\/p>\n<h2 data-start=\"2598\" data-end=\"2655\"><strong data-start=\"2601\" data-end=\"2655\">What are the symptoms<\/strong><\/h2>\n<p data-start=\"2657\" data-end=\"2894\">Most cases reported in humans are <strong data-start=\"2709\" data-end=\"2726\">asymptomatic<\/strong> or produce mild symptoms, as was the case with the Mallorcan donor. However, in those who do develop clinical manifestations, the most frequent signs include: <\/p>\n<ul data-start=\"2896\" data-end=\"3050\">\n<li data-start=\"2896\" data-end=\"2915\">\n<p data-start=\"2898\" data-end=\"2915\">Moderate fever<\/p>\n<\/li>\n<li data-start=\"2916\" data-end=\"2935\">\n<p data-start=\"2918\" data-end=\"2935\">Headache<\/p>\n<\/li>\n<li data-start=\"2936\" data-end=\"2974\">\n<p data-start=\"2938\" data-end=\"2974\">Skin rashes or eruptions<\/p>\n<\/li>\n<li data-start=\"2975\" data-end=\"3011\">\n<p data-start=\"2977\" data-end=\"3011\">Muscle and joint pain<\/p>\n<\/li>\n<li data-start=\"3012\" data-end=\"3050\">\n<p data-start=\"3014\" data-end=\"3050\">Persistent feeling of tiredness<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3052\" data-end=\"3171\">Although rare, the Usutu virus can cause serious complications, especially in immunocompromised individuals:<\/p>\n<ul data-start=\"3173\" data-end=\"3301\">\n<li data-start=\"3173\" data-end=\"3218\">\n<p data-start=\"3175\" data-end=\"3218\"><strong data-start=\"3175\" data-end=\"3190\">Encephalitis<\/strong> (inflammation of the brain)<\/p>\n<\/li>\n<li data-start=\"3219\" data-end=\"3236\">\n<p data-start=\"3221\" data-end=\"3236\"><strong data-start=\"3221\" data-end=\"3234\">Hepatitis<\/strong><\/p>\n<\/li>\n<li data-start=\"3237\" data-end=\"3301\">\n<p data-start=\"3239\" data-end=\"3301\"><strong data-start=\"3239\" data-end=\"3268\">Neurological alterations<\/strong> requiring urgent care<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3303\" data-end=\"3508\">The specialists point out that, despite its infrequent detection, the Balearic Islands case demonstrates that epidemiological surveillance must remain active in the presence of the virus in local mosquitoes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The identification of the first human case in Spain confirms that the virus, transmitted by mosquitoes and associated with wild birds, can be transmitted to humans, although generally with mild symptoms.<\/p>\n","protected":false},"author":33,"featured_media":138642,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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