{"id":29177,"date":"2025-08-14T08:15:14","date_gmt":"2025-08-14T15:15:14","guid":{"rendered":"https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/?p=29177"},"modified":"2025-08-14T15:37:21","modified_gmt":"2025-08-14T22:37:21","slug":"the-quiet-constant-fight-against-equine-diseases","status":"publish","type":"post","link":"https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/index.php\/2025\/08\/14\/the-quiet-constant-fight-against-equine-diseases\/","title":{"rendered":"The Quiet, Constant Fight Against Equine Diseases\u00a0"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"alignright size-large is-resized\"><a href=\"https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/wp-content\/uploads\/2019\/08\/Horses.jpg\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/wp-content\/uploads\/2019\/08\/Horses-1024x683.jpg\" alt=\"\" class=\"wp-image-19154\" style=\"object-fit:cover;width:400px;height:300px\" srcset=\"https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/wp-content\/uploads\/2019\/08\/Horses.jpg 1024w, https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/wp-content\/uploads\/2019\/08\/Horses-300x200.jpg 300w, https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/wp-content\/uploads\/2019\/08\/Horses-768x512.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>CDFA is on the front lines of a silent battle, one that impacts California\u2019s horses and the equine industry every single day. While outbreaks like bird flu may get more headlines, the battle to safeguard California\u2019s equine community against diseases is waged daily through thoughtful, consistent effort.&nbsp;<\/p>\n\n\n\n<p>CDFA\u2019s Animal Health Branch works&nbsp;to protect horses from these threats &#8212; diseases like Equine Infectious Anemia (EIA) and Equine Herpes Myeloencephalopathy (EHM). In fact, nearly every day since the start of 2025, California has had at least one, if not multiple, equine disease quarantines actively in place.&nbsp;<\/p>\n\n\n\n<p><strong>EIA: An Invisible Threat<\/strong>&nbsp;<\/p>\n\n\n\n<p>Equine Infectious Anemia is a bloodborne disease with no cure or vaccine, often leading to a heartbreaking decision for owners: euthanasia. It can be spread by biting insects, but more often is spread by&nbsp;needles used on more than one horse. A significant hotspot for EIA exposure is the clandestine world of unsanctioned quarterhorse racing. Because sanctioned racing is highly regulated to ensure fairness and protect the horses, unsanctioned tracks have become a rapidly rising \u201cworkaround\u201d for those who want to race without rules. Over the last five years, 68 EIA cases have been identified, with all but two directly linked to this high-risk community.&nbsp;<\/p>\n\n\n\n<p>As of June 2025, there have already been 5 EIA cases, leading to quarantines for 51 horses across 4 premises.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Annual CDFA EIA tests performed on California horses&nbsp;<\/td><\/tr><tr><td>2019: 28,472 tests; 0 positives&nbsp;<br>2020: 26,397 tests; 1 positive<br>2021: 29,527 tests; 1 positive<br>2022: 30,212 tests; 40 positives&nbsp;&nbsp;<br>2023: 28,521 tests; 6 positives&nbsp;<br>2024: 27,169 tests; 15 positives&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>EHM: An Evolving Threat<\/strong>&nbsp;<\/p>\n\n\n\n<p>Equine Herpes Myeloencephalopathy, or EHM, is caused by EHV-1, a herpesvirus that can lurk quietly in an infected horse&#8211;showing no signs of disease&#8211;and activate at any time. When a horse is sick with EHV-1, it is contagious to other horses by direct contact or contaminated equipment. Unfortunately, some EHV-1 infections can have catastrophic impacts on a horse\u2019s nervous system. While many horses recover with supportive care, others must be euthanized. In 2022, an EHV-1 outbreak led to approximately 1,400 horses being quarantined across California.&nbsp;<\/p>\n\n\n\n<p>Fortunately, recent research is refining our understanding of EHV-1.&nbsp;<\/p>\n\n\n\n<p>One of the most critical discoveries shows that many horses initially test negative for EHV-1 when they first show a fever, only to test positive a few days later. This was strikingly evident during California\u2019s 2022 EHV-1 outbreak, when nearly 40 percent of confirmed cases initially tested negative at the first sign of fever, only to turn positive upon re-test two to three days later. This finding directly led to a change in nationwide protocols, now recommending repeat testing for febrile horses if their initial test&nbsp;is negative. &nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>CDFA case numbers for EHV-1 over the past five years illustrate how consistently the agency deals with this challenge&nbsp;<\/td><\/tr><tr><td>2020: 23 cases&nbsp;<br>2021: 13 cases&nbsp;<br>2022: 177 cases&nbsp;<br>2023: 14 cases&nbsp;<br>2024: 3 cases&nbsp;<br>2025 17 cases &nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Always Working for California&#8217;s Horses<\/strong>&nbsp;<\/p>\n\n\n\n<p>California&#8217;s large equine community means that CDFA&#8217;s robust disease response often sets the standard for other states. Actions&nbsp;like quarantine duration are quickly adopted nationwide. CDFA is committed to science-based improvements and flexible solutions, understanding that every facility presents its own unique challenges for isolation and containment.&nbsp;<\/p>\n\n\n\n<p>Staying ahead of disease threats while also responding swiftly to outbreaks means the system is working well. It also means the equine industry is improving its biosecurity, and that horse owners are collaborating closely with CDFA, veterinarians and other professional organizations on preventative measures. It\u2019s a testament to effective management and a shared commitment to keeping California\u2019s horses healthy.&nbsp;<\/p>\n\n\n\n<p>For more details on each of these equine diseases, please visit:&nbsp;<\/p>\n\n\n\n<p><a href=\"https:\/\/www.cdfa.ca.gov\/ahfss\/animal_health\/equine_herpes_virus.html\">https:\/\/www.cdfa.ca.gov\/ahfss\/animal_health\/equine_herpes_virus.html<\/a><\/p>\n\n\n\n<p>And:&nbsp;<\/p>\n\n\n\n<p><a href=\"https:\/\/www.cdfa.ca.gov\/ahfss\/Animal_Health\/EquineInfectiousAnemia.html\">https:\/\/www.cdfa.ca.gov\/ahfss\/Animal_Health\/EquineInfectiousAnemia.html<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>CDFA is on the front lines of a silent battle, one that impacts California\u2019s horses and the equine industry every single day. While outbreaks like bird flu may get more headlines, the battle to safeguard California\u2019s equine community against diseases &hellip; <a href=\"https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/index.php\/2025\/08\/14\/the-quiet-constant-fight-against-equine-diseases\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-29177","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>The Quiet, Constant Fight Against Equine Diseases\u00a0 - CDFA&#039;s Planting Seeds Blog<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/index.php\/2025\/08\/14\/the-quiet-constant-fight-against-equine-diseases\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"The Quiet, Constant Fight Against Equine Diseases\u00a0 - CDFA&#039;s Planting Seeds Blog\" \/>\r\n<meta property=\"og:description\" content=\"CDFA is on the front lines of a silent battle, one that impacts California\u2019s horses and the equine industry every single day. 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