{"id":52576,"date":"2026-01-21T09:05:00","date_gmt":"2026-01-21T14:05:00","guid":{"rendered":"https:\/\/www.allaboutbirds.org\/news\/?p=52576"},"modified":"2026-01-21T11:55:59","modified_gmt":"2026-01-21T16:55:59","slug":"avian-influenza-outbreak-should-you-take-down-your-bird-feeders","status":"publish","type":"post","link":"https:\/\/www.allaboutbirds.org\/news\/avian-influenza-outbreak-should-you-take-down-your-bird-feeders\/","title":{"rendered":"Avian Influenza Outbreak: Should You Take Down Your Bird Feeders?"},"content":{"rendered":"\n<p><small><em>Originally published April 2022. Updated through January 2026 to reflect further developments in the outbreak.<\/em><\/small><\/p>\n\n\n\n<p>Many people are concerned about the outbreak of avian influenza, or bird flu, that began in 2022 and has affected domestic poultry, waterfowl, raptors, shorebirds, other species of birds, and some mammals in many parts of the world. Because the current strain (H5N1) causes heavy losses to poultry, it is referred to as highly pathogenic avian influenza, or HPAI. <\/p>\n\n\n\n<p>Transmission of avian influenza <a href=\"https:\/\/www.cdc.gov\/bird-flu\/virus-transmission\/avian-in-humans.html\">from birds to humans is rare<\/a>, according to Centers for Disease Control&#8217;s summary of current avian influenza <a href=\"https:\/\/www.cdc.gov\/bird-flu\/situation-summary\/index.html\">testing and infection statistics<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reports of Avian Flu in Birds<\/h2>\n\n\n\n<p><span class=\"NormalTextRun SCXW222232351 BCX0\">This H5N1 strain of avian influenza virus affects a wide variety of wild birds, including hawks, eagles, falcons, owls, crows, vultures, shorebirds, game birds, seabirds, and especially waterfowl such as Canada Geese and Mallards (see <a href=\"#species-list\">list of species with HPAI detections<\/a>, below). The virus is shed in the saliva, mucus, and feces of infected birds and is transmitted to other birds via ingestion or inhalation. <\/span><\/p>\n\n\n\n<p>Because of the duration of this outbreak, its recent spread to mammal species, and widespread mortalities in some types of wild birds, there has been concern about whether it&#8217;s safe for people to feed wild birds. In January 2025, March 2023, and April 2022, we checked in with Dr. Sarah Bevins and Dr. Julianna Lenoch, who lead the USDA APHIS <a href=\"https:\/\/www.aphis.usda.gov\/livestock-poultry-disease\/avian\/avian-influenza\">National Wildlife Disease Program<\/a> to compile some key points regarding HPAI in songbirds and other feeder visitors. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"risk-songbirds\">Low Risk of Avian Flu to Songbirds<\/h2>\n\n\n\n<p>There has been widespread transmission of avian flu to wild bird species including waterfowl and raptors. However, there have been relatively few documented <a href=\"#species-list\">cases of HPAI in songbirds<\/a> and other typical feeder visitors to date, <span class=\"TextRun SCXW214949567 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW214949567 BCX0\">although this may change with increased testing or changes to the virus<\/span><\/span>. That means there is currently a<strong>&nbsp;low risk of an outbreak among wild songbirds<\/strong>, and <strong>no <a href=\"https:\/\/ask.usda.gov\/s\/article\/Should-bird-feeders-be-taken-down-to-prevent-the-spread-of-diseases-such-as-bird-flu\">official recommendation<\/a> to take down feeders unless you also keep domestic poultry<\/strong>, according to the National Wildlife Disease Program. We do always recommend that you <a href=\"https:\/\/feederwatch.org\/learn\/feeding-birds\/safe-feeding-environment\/\">clean bird feeders and birdbaths regularly<\/a> as a way to keep many kinds of diseases at bay.&nbsp;<\/p>\n\n\n\n<p>We also always recommend that you follow any recommendations put out by your state government, even in cases where that advice conflicts with ours. The <a href=\"https:\/\/www.cdc.gov\/bird-flu\/virus-transmission\/avian-in-birds.html\">CDC&#8217;s page on avian influenza in birds<\/a> compiles additional helpful information and resources, in English and Spanish.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-we-know\">How do we know songbirds are at low risk?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>USDA APHIS has a strong, multiyear <a href=\"https:\/\/www.aphis.usda.gov\/livestock-poultry-disease\/avian\/avian-influenza#:~:text=conduct%20surveillance%20testing%20on%20wild%20birds\">surveillance program<\/a> that routinely samples wild birds, including flocks of songbirds (and other species such as Rock Pigeons and Mourning Doves that are often around humans), for the presence of avian influenza. Their results are displayed on a <a href=\"https:\/\/www.aphis.usda.gov\/livestock-poultry-disease\/avian\/avian-influenza\/wild-bird-surveillance-dashboard\">Wild Bird Avian Influenza Surveillance dashboard<\/a>. Detections of HPAI in wild birds from all sources are reported by USDA APHIS: <a href=\"https:\/\/www.aphis.usda.gov\/livestock-poultry-disease\/avian\/avian-influenza\/hpai-detections\/wild-birds\">Detections of Highly Pathogenic Avian Influenza in Wild Birds<\/a>. <\/li>\n\n\n\n<li>Highly pathogenic avian influenza does not affect all types of birds equally. For example, waterfowl often carry and transmit bird flu, and with the current strain they sometimes get sick or die. Raptors are much more sensitive to the disease. Domestic poultry are extremely susceptible to HPAI and spread the disease easily, leading to up to 100% mortality of affected flocks.<\/li>\n\n\n\n<li>Songbirds are much less likely than waterfowl to contract variants of avian influenza and less likely to shed large amounts of virus, meaning they do not transmit the disease easily. (For detailed reviews, see <a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1155\/2024\/4009552\">Ringenberg et al. 2024<\/a> in the journal <em>Transboundary and Emerging Diseases<\/em>, and <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/33114239\/\">Shriner and Root 2020<\/a> in the journal <em>Viruses<\/em>.)<\/li>\n\n\n\n<li>According to a separate study in <em>Journal of Wildlife Diseases<\/em>, &#8220;&#8230;although passerines and terrestrial wild birds may have a limited role in the epidemiology of IAV [avian influenza A viruses] when associated with infected domestic poultry or other aberrant hosts, there is no evidence supporting their involvement as natural reservoirs for IAV.&#8221; (<a href=\"https:\/\/bioone.org\/journals\/journal-of-wildlife-diseases\/volume-50\/issue-4\/2014-02-043\/ARE-PASSERINE-BIRDS-RESERVOIRS-FOR-INFLUENZA-A-VIRUSES\/10.7589\/2014-02-043.short\">Slusher et al. 2014<\/a>)<\/li>\n\n\n\n<li>For these reasons, it is unlikely that bird feeders will contribute to an outbreak among songbirds.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"advice-poultry\">If songbirds are at low risk, why are people who keep poultry advised to take down their bird feeders?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The main concern with songbirds is the chance that a rare individual might transmit an infection to poultry. This is a concern because poultry are so much more vulnerable than songbirds to HPAI.<\/li>\n\n\n\n<li>The key intervention is to keep songbirds away from poultry; it&#8217;s less important to keep songbirds away from each other.<\/li>\n\n\n\n<li>If you have a backyard poultry flock, these are the most important steps to take:<br>(click for full info on these biosecurity measures from USDA APHIS)\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.aphis.usda.gov\/publications\/wildlife_damage\/fsc-hpai-wildlife-practices-protect.pdf\">make their food inaccessible<\/a> to wild birds<\/li>\n\n\n\n<li><a href=\"https:\/\/www.aphis.usda.gov\/publications\/wildlife_damage\/fsc-hpai-wildlife-practices-reduce.pdf\">make their water inaccessible<\/a> to wild birds<\/li>\n\n\n\n<li><a href=\"https:\/\/www.aphis.usda.gov\/publications\/wildlife_damage\/fsc-hpai-wildlife-practices-prevent.pdf\">keep poultry indoors or otherwise physically separated from wild birds<\/a>, if possible<\/li>\n\n\n\n<li>change your clothes and wash hands before tending to poultry (or pet birds)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>As a secondary measure, USDA APHIS recommends for poultry owners to take down wild bird feeders or keep them well away from their captive flock<\/li>\n\n\n\n<li>If you keep chickens or ducks, please see also latest information <span data-contrast=\"auto\">from the <\/span><a href=\"https:\/\/www.aphis.usda.gov\/aphis\/ourfocus\/animalhealth\/animal-disease-information\/avian\/defend-the-flock-program\"><span data-contrast=\"none\">USDA Animal Plant and Health Inspection Service<\/span><\/a>.<span data-contrast=\"auto\">&nbsp;&nbsp;<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"nest-boxes\">If you keep nest boxes:<\/h3>\n\n\n\n<p>Avian influenza is only rarely transmitted to humans, according to the USDA. The Centers for Disease Control and Prevention <a href=\"https:\/\/www.cdc.gov\/bird-flu\/situation-summary\/inhumans.html\">considers the general public health risk<\/a> from avian flu to be low. Nevertheless, our NestWatch project always advises good hygiene and highly recommends that people wear disposable gloves and\/or wash their hands thoroughly after checking nest boxes. Most birds that use nest boxes are songbirds, which are at low risk for contracting or transmitting avian influenza. <strong>If you monitor waterfowl or raptor nests<\/strong> (e.g., Wood Duck, Common Merganser, Canada Goose, American Kestrel, Barred Owl), we suggest you wear gloves, change or wash gloves and disinfect equipment between nest boxes (using soapy water, a disinfectant such as Lysol, or a dilute bleach solution), wear a mask when cleaning out nest boxes, and change clothes and footwear before visiting any domestic poultry.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"rehabilitators\">If you are a wildlife rehabilitator:<\/h3>\n\n\n\n<p>Wildlife rehabilitators should take precautions when accepting sick birds so that they don&#8217;t inadvertently introduce HPAI to the rest of their patients. Here&#8217;s <a href=\"https:\/\/www.aphis.usda.gov\/publications\/animal_welfare\/ac-tech-note-captive-wild-bird-biosecurity-508.pdf\">further guidance for rehabbers, from USDA APHIS<\/a>. Rehabbers in New York State are also encouraged to <a href=\"https:\/\/www.vet.cornell.edu\/hospitals\/janet-l-swanson-wildlife-hospital\">contact the Janet L. Swanson Wildlife Hospital<\/a> at Cornell University for more information.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"find-sick-bird\">What to do if you find a sick or dead bird:<\/h3>\n\n\n\n<p>Avoid handling sick or dead birds. Instead, call your state wildlife health agency; they can determine cause of death and send the bird to the appropriate lab for testing. Additionally, keep pets (including pet birds) away from sick or dead wild birds.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span data-contrast=\"auto\">Avoid contact with birds that appear sick or have died<\/span><\/li>\n\n\n\n<li><span data-contrast=\"auto\">Avoid contact with surfaces that have bird feces<\/span><\/li>\n\n\n\n<li><span data-contrast=\"auto\">If you must touch sick or dead birds:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span>\n<ul class=\"wp-block-list\">\n<li><span data-contrast=\"auto\">Wear gloves and a face mask&nbsp;<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/li>\n\n\n\n<li><span data-contrast=\"auto\">Place dead birds in a double-bagged garbage bag<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/li>\n\n\n\n<li><span data-contrast=\"auto\">Throw away your gloves and facemask after use&nbsp;<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/li>\n\n\n\n<li><span data-contrast=\"auto\">Wash your hands well with soap and warm water<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><span data-contrast=\"auto\">Bird flu is generally not a risk to food safety. Poultry, meat, and eggs that are safely handled and cooked to an internal temperature of 165\u00b0F are safe to eat.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span>Pasteurized milk is also safe; however the avian flu virus has been found in raw milk and this should not be consumed by people or fed to cats.<\/p>\n\n\n\n<p><span data-contrast=\"auto\">If you feel sick after having contact with sick or dead birds, contact your health care provider.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">&nbsp;<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"mammals\">Has Avian Flu Been Reported in Mammals?<\/h3>\n\n\n\n<p><span class=\"NormalTextRun SCXW222232351 BCX0\">There have also been reports of mammals such as red foxes, skunks, bobcats, fishers, and bears infected with avian influenza, likely from eating infected birds. Outside the U.S. avian flu has infected farmed mink and has caused losses at marine mammal colonies in South America. In March 2024 the USDA reported that <a href=\"https:\/\/www.aphis.usda.gov\/news\/agency-announcements\/federal-state-veterinary-public-health-agencies-share-update-hpai\">avian flu has been found in cattle<\/a> in several U.S. states. The CDC has additional information on <a href=\"https:\/\/www.cdc.gov\/bird-flu\/situation-summary\/mammals.html\">avian flu in cattle and associated risks to humans<\/a>.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Additional Resources:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.aphis.usda.gov\/aphis\/ourfocus\/animalhealth\/animal-disease-information\/avian\/avian-influenza\/hpai-2022\/2022-hpai-wild-birds\">Latest outbreak statistics<\/a> from USDA APHIS<\/li>\n\n\n\n<li>USDA APHIS page about <a href=\"https:\/\/www.aphis.usda.gov\/aphis\/ourfocus\/animalhealth\/animal-disease-information\/avian\/avian-influenza\/ai-wild-birds\">avian influenza in wild birds<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.aphis.usda.gov\/animal_health\/downloads\/animal_diseases\/ai\/faqs.pdf\">FAQ about avian influenza and wild birds<\/a> (USDA APHIS)<\/li>\n\n\n\n<li><a href=\"https:\/\/www.cdc.gov\/bird-flu\/risk-factors\/bird-hobbyists.html\">Advice for birdwatchers and bird hobbyists<\/a> (Centers for Disease Control)<\/li>\n\n\n\n<li>Simple <a href=\"https:\/\/www.aphis.usda.gov\/animal_health\/downloads\/animal_diseases\/ai\/hpaifactsheet_wildlife-biosecurity.pdf\">biosecurity measures for preventing avian influenza<\/a> on farms (USDA APHIS)<\/li>\n\n\n\n<li><a href=\"https:\/\/www.vet.cornell.edu\/highly-pathogenic-avian-influenza-bird-flu-resource-center\">Highly Pathogenic Avian Influenza (Bird Flu) Resource Center<\/a> (Cornell College of Veterinary Medicine)<\/li>\n\n\n\n<li><a href=\"https:\/\/cwhl.vet.cornell.edu\/article\/highly-pathogenic-avian-influenza\">Avian influenza in New York State<\/a> (Cornell Wildlife Health Lab)<\/li>\n\n\n\n<li><a href=\"https:\/\/cals.cornell.edu\/news\/2025\/02\/frequently-asked-questions-about-bird-flu-new-york-state\">FAQ about Avian Flu in New York State<\/a> (Cornell College of Agriculture and Life Sciences)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"species-list\">Wild bird species with HPAI detections in 2022\u20132026<\/h2>\n\n\n\n<p>Updated January 21, 2026. Total number of detections in wild birds: 16,657 (plus 1,062 captive birds). Detections in passerines: 472. See <a href=\"https:\/\/www.aphis.usda.gov\/aphis\/ourfocus\/animalhealth\/animal-disease-information\/avian\/avian-influenza\/hpai-2022\/2022-hpai-wild-birds\">Detections of Highly Pathogenic Avian Influenza in Wild Birds<\/a> for latest detections.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Passerines (27 species)<\/h3>\n\n\n\n<p>American Crow (118 individuals, plus 15 unidentified crow spp.)<br>American Robin (4)<br>Barn Swallow (2)<br>Black-billed Magpie (16)<br>Blue Jay (4)<br>Boat-tailed Grackle (1)<br>Brewer&#8217;s Blackbird (6)<br>Common Grackle (19, plus 1 unidentified grackle spp.)<br>Common Raven (62)<br>Dark-eyed Junco (3)<br>European Starling (32)<br>Fish Crow (13)<br>Great-tailed Grackle (17)<br>Horned Lark (2)<br>House Finch (2)<br>House Sparrow (127)<br>Lark Bunting (1)<br>Lark Sparrow (1)<br>Lincoln&#8217;s Sparrow (1)<br>Red-winged Blackbird (2, plus 2 unidentified blackbird spp.)<br>Savannah Sparrow (4)<br>Say&#8217;s Phoebe (2)<br>Song Sparrow (5)<br>Summer Tanager (1)<br>Tree Swallow (1, plus 2 unidentified swallow spp.)<br>Western Kingbird (1)<br>White-crowned Sparrow (1)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Other Feeder-Associated Species (10 Species)<\/h3>\n\n\n\n<p>California Quail (7)<br>Cooper&#8217;s Hawk (42)<br>Eurasian Collared-Dove (8)<br>Gambel&#8217;s Quail (1)<br>Mourning Dove (7)<br>Rock Pigeon (88, plus 1 unidentified pigeon spp.)<br>Ruffed Grouse (1)<br>Sharp-shinned Hawk (7)<br>White-winged Dove (1)<br>Wild Turkey (27)<br><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Other species (144 species)<\/h3>\n\n\n\n<p>American Barn Owl<br>American Black Duck<br>American Coot<br>American Goshawk<br>American Herring Gull<br>American Kestrel<br>American White Pelican<br>American Wigeon<br>American Woodcock<br>Arctic Tern<br>Bald Eagle<br>Barred Owl<br>Black Scoter<br>Black Skimmer<br>Black Turnstone<br>Black Vulture<br>Black-bellied Plover<br>Black-bellied Whistling-Duck <br>Black-crowned Night Heron<br>Black-legged Kittiwake<br>Black-necked Stilt <br>Blue-winged Teal<br>Bonaparte&#8217;s Gull<br>Brandt&#8217;s Cormorant<br>Brant<br>Broad-winged Hawk<br>Brown Pelican<br>Bufflehead<br>Burrowing Owl<br>Cackling Goose<br>California Condor<br>California Gull<br>Canada Goose<br>Canvasback<br>Caspian Tern<br>Cinnamon Teal<br>Common Eider<br>Common Goldeneye<br>Common Loon<br>Common Merganser<br>Common Murre<br>Common Tern<br>Crested Caracara<br>Double-crested Cormorant<br>Dunlin<br>Eared Grebe<br>Eastern Screech-Owl<br>Ferruginous Hawk<br>Forster&#8217;s Tern<br>Fulvous Whistling-Duck<br>Gadwall<br>Glaucous Gull<br>Glaucous-winged Gull<br>Glossy Ibis<br>Golden Eagle<br>Great Black-backed Gull<br>Great Blue Heron<br>Great Egret<br>Great Horned Owl<br>Greater Sage-Grouse<br>Greater Scaup<br>Greater White-fronted Goose<br>Greater Yellowlegs<br>Green Heron<br>Green-winged Teal<br>Harris&#8217;s Hawk<br>Hooded Merganser<br>Horned Grebe<br>Iceland Gull (Thayer&#8217;s)<br>Laughing Gull<br>Lesser Scaup<br>Lesser Yellowlegs<br>Long-eared Owl<br>Long-tailed Duck<br>Mallard<br>Merlin<br>Mottled Duck<br>Muscovy Duck<br>Mute Swan<br>Neotropic Cormorant<br>Northern Fulmar<br>Northern Gannet<br>Northern Harrier<br>Northern Pintail<br>Northern Shoveler<br>Osprey<br>Pacific Loon<br>Parasitic Jaeger<br>Peregrine Falcon<br>Pied-billed Grebe<br>Prairie Falcon<br>Razorbill<br>Red-breasted Merganser<br>Red-necked Grebe<br>Red-necked Phalarope<br>Red-shouldered Hawk<br>Red-tailed Hawk<br>Redhead<br>Ring-billed Gull<br>Ring-necked Duck<br>Ring-necked Pheasant<br>Roseate Spoonbill<br>Ross&#8217;s Goose<br>Rough-legged Hawk<br>Royal Tern<br>Ruddy Duck<br>Ruddy Turnstone<br>Sabine&#8217;s Gull<br>Sanderling<br>Sandhill Crane<br>Sandwich Tern<br>Short-billed Gull<br>Short-eared Owl<br>Short-tailed Shearwater<br>Snow Goose<br>Snowy Egret<br>Snowy Owl<br>Snowy Plover<br>Surf Scoter<br>Swainson&#8217;s Hawk<br>Trumpeter Swan<br>Tundra Swan<br>Turkey Vulture<br>Western Cattle-Egret<br>Western Grebe<br>Western Gull<br>Western Sandpiper<br>Western Screech-Owl<br>White-faced Ibis<br>White-winged Scoter<br>Willet<br>Wood Duck<br>Wood Stork<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Originally published April 2022. Updated through January 2026 to reflect further developments in the outbreak. Many people are concerned about the outbreak of avian influenza, or bird flu, that began<a class=\"excerpt-read-more\" href=\"https:\/\/www.allaboutbirds.org\/news\/avian-influenza-outbreak-should-you-take-down-your-bird-feeders\/\" title=\"ReadAvian Influenza Outbreak: Should You Take Down Your Bird Feeders?\">&#8230; Read more &raquo;<\/a><\/p>\n","protected":false},"author":2,"featured_media":52599,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_tec_requires_first_save":true,"_birdpress_living_bird_toc":0,"_birdpress_living_bird_toc_title":"","_birdpress_featured_image":false,"_birdpress_hero_toggle":false,"_birdpress_hero_type":"image","_birdpress_hero_image_type":"image","_birdpress_hero_style":"default","_birdpress_hero_ratio":"","_birdpress_hero_h1":"","_birdpress_hero_media_id":0,"_birdpress_hero_media_array_id":[],"_birdpress_hero_media_array":[],"_birdpress_hero_media":0,"_birdpress_hero_video_id":0,"_birdpress_hero_video":0,"_birdpress_hero_youtube":"","_birdpress_hero_content":true,"_birdpress_hero_byline":"","_birdpress_hero_byline_bottom":"","_birdpress_hero_button_link":"","_birdpress_hero_button_text":"","_birdpress_hero_button_color":"","_birdpress_hero_date":false,"original_guid":"","_birdpress_hide_search":false,"_birdpress_page_width":"","_birdpress_global_cta":false,"_birdpress_widget_sidebar":"","_birdpress_next_article":0,"_birdpress_next_article_title":"","_birdpress_prev_article":0,"_birdpress_prev_article_title":"","_birdpress_sub_navigation_id":0,"_birdpress_sub_navigation":"","_birdpress_sub_navigation_title":false,"_birdpress_anchor_navigation_id":1175,"_birdpress_anchor_navigation":"avian-flu-navigation","_birdpress_postType":"both","_birdpress_categoryID":0,"_birdpress_tagID":0,"_birdpress_parentPostID":0,"_birdpress_parentPostTitle":"","_birdpress_menuID":0,"_birdpress_menuName":"","_birdpress_listHeader":"","_birdpress_listLayout":"card-display","_birdpress_listColumns":"","_birdpress_maxItems":12,"_birdpress_listPaginate":true,"_birdpress_displaySort":true,"_birdpress_sortOrder":"DESC","_birdpress_sortBy":"date","_birdpress_listID":"","_birdpress_listClass":"","_birdpress_displayImages":true,"_birdpress_displayCaptions":false,"_birdpress_displayExcerpts":false,"_birdpress_attTop":"","_birdpress_attBottom":"","_birdpress_showLogos":false,"_birdpress_post_logo":0,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"_tribe_blocks_recurrence_rules":"","_tribe_blocks_recurrence_description":"","_tribe_blocks_recurrence_exclusions":"","wds_primary_category":1,"wds_primary_topic":0,"wds_primary_content-format":0,"wds_primary_cornell-lab-project":0,"wds_primary_host-project":0,"wds_primary_read-more-tag":0,"footnotes":""},"categories":[1],"tags":[],"topic":[997,1040,1103,998],"content-format":[1055],"cornell-lab-project":[],"host-project":[],"read-more-tag":[],"class_list":["post-52576","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","topic-biology","topic-disease-biology","topic-news","topic-news-and-features","content-format-article"],"metadata":{"associated-posts":[""],"wpa_off":[""],"_edit_lock":["1771524493:26"],"_edit_last":["2"],"wdsi_message_id":[""],"wdsi_do_not_show":[""],"_wds_trimmed_excerpt":["Originally published April 2022. 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