Bird Flu Tracker Avian Influenza A H5N1

Avian flu detections in the US have dropped significantly this past week, with only one new poultry case reported in Meade County, South Dakota, affecting 60 birds, according to the US Department of Agricultures Animal and Plant Health Inspection Service via CIDRAP. Wild bird infections included gulls in San Diego County, California, and a bald eagle in Clay County, Florida, among 12 detections.

In the past 30 days, APHIS tracked the virus in 15 commercial flocks and eight backyard flocks nationwide, impacting 660,000 birds. February 2026 saw the highest toll this year at 11.41 million poultry affected. Colorado reports more cases early this year than at this point in 2025, including a major hit to 1.33 million egg-laying chickens in Weld County, per the Colorado Department of Agriculture, though no human spillover since summer 2024. The state has confirmed 10 human cases total in agricultural workers, all mild with flu-like symptoms treatable by antivirals.

CDC surveillance shows no unusual flu activity in people, with over 32,600 monitored and 1,320 tested for novel influenza A since February 2022, and no recent indicators of sustained human spread.

Globally, H5N1 surfaced in 44 dead peacocks in Indias Karnataka state, prompting surveillance in 38 villages, infected zones within 3 kilometers, and human screenings for flu-like illnesses, as reported in local news updates. Canadas Auditor General noted on May 4 that federal bird flu responses are working but gaps remain, including over 95 percent of vaccine doses expiring unused by February.

No human cases or deaths linked to bird flu emerged in the US in the last 24 hours.

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In the last 24 hours, US health officials report no new human cases of bird flu, or H5N1 avian influenza, amid ongoing monitoring of dairy and poultry farms. The CDC confirms all recent infections remain mild, with the latest human case—a Michigan farmworker—fully recovered as of late April, according to CDC updates. No hospitalizations or deaths have been linked to the virus in humans this year.

Focus remains on animal outbreaks, particularly in cattle. The USDA notes over 70 dairy herds in 11 states affected since March, with pasteurization confirmed safe by the FDA, preventing human transmission through milk. Raw milk warnings persist, as states like California and Colorado report rising detections in unpasteurized products.

Globally, the WHO reports a mild human case in Cambodia from wild bird exposure, the first there since 2023, with no human-to-human spread. In Europe, the UK confirms H5N1 in poultry flocks, prompting culls, per DEFRA statements. New Zealand celebrates a bird conservation win unrelated to flu, hosting wild kiwi at Parliament, as 1News details.

Experts like those at Johns Hopkins urge vigilance but stress low public risk, with vaccines in trials. Wastewater surveillance shows stable low levels nationwide.

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Eleven more California marine mammals, mostly sea lions, have tested positive for H5N1 avian flu, bringing the outbreak total to 58 in four counties, according to CIDRAP. The cases, first detected in February, include one otter and show symptoms like tremors and abnormal breathing, mainly in San Mateo County.

In poultry news, four U.S. commercial farms reported outbreaks: one each in North Dakota, South Dakota, Minnesota with 62,900 turkeys in Big Stone County, and Georgia. CIDRAP notes commercial detections are dropping in April, affecting about 700,000 birds in the past 30 days, down from March. Wild bird cases also slowed, with 13 USDA notices in 10 days, including three bald eagles in Minnesota, Pennsylvania, and New York, plus gulls in California.

The CDC reports no new human H5N1 infections for the week ending April 18, with no person-to-person spread identified in the U.S. Seasonal flu activity is low and declining nationwide.

Elsewhere, University of Nebraska-Lincoln researchers announced a promising new vaccine platform protecting mice and cattle against multiple H5N1 strains, per UNL research. Moderna launched a large avian flu study despite prior funding cuts, says Infectious Disease Advisor. In wild birds, genotype D1.1 H5N1 viruses are rapidly expanding across North America, reports ESWI.

No major human cases or escalations in the last 24 hours.

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U.S. Agriculture Secretary Brooke Rollins testified before a Senate budget hearing on April 22, addressing the ongoing avian bird flu outbreak ravaging poultry flocks. NTD News reports Rollins stated no effective vaccine exists yet, emphasizing caution against experimental shots without full understanding of the virus. She highlighted high fertilizer prices exacerbating farm challenges amid the crisis.

CIDRAP confirms recent U.S. outbreaks, with four commercial poultry facilities hit last week—one each in North Dakota, South Dakota, Minnesota, and Georgia. Minnesotas Big Stone County turkey farm lost 62,900 birds. Over the past 30 days, roughly 700,000 birds affected across 28 commercial and eight backyard flocks. Wild bird detections slowed, but three bald eagles in Minnesota, Pennsylvania, and New York tested positive, alongside California gulls.

In California, 11 more marine mammals—mostly sea lions—confirmed with H5N1, pushing the outbreak total to 58 across four counties, per CIDRAP. This marks the states first such detections in marine life since February, with symptoms like tremors and respiratory issues.

CDC's FluView for week ending April 18 reports no new human H5 infections in the U.S., with zero person-to-person transmission identified. Globally, WHO's April 24 update notes avian flu circulating in poultry, posing mutation risks, while European data through February tallied thousands of bird cases but just 10 mild human infections in Asia.

Moderna launched a large avian flu study despite prior funding cuts, and researchers announced a promising new vaccine effective in mice and cattle, per Michigan Farm News.

Activity appears stable with no major escalations in the last 24 hours.

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Bird Flu Update

Health officials across the United States continue monitoring an expanding avian influenza outbreak affecting both wild and domestic bird populations. According to the CDC and USDA tracking data, commercial poultry detections have slowed this month compared with March, with twenty-eight confirmed outbreaks reported across twenty commercial and eight backyard flocks. Roughly seven hundred thousand birds have been affected in the past thirty days.

The outbreak in Minnesota's Big Stone County remains significant, involving sixty-two thousand nine hundred birds on a commercial turkey farm. Additional cases have been reported in North and South Dakota and Georgia, with each state reporting new avian flu outbreaks at commercial poultry facilities.

Wild bird detections show a declining trend, with thirteen notices from the USDA's Animal and Plant Health Inspection Service reported in the past ten days. Three Bald Eagles in Minnesota, Pennsylvania, and New York have tested positive for the virus, alongside four additional birds including gulls and a Red-necked phalarope from San Mateo County, California.

The California marine mammal outbreak continues to draw attention from veterinary and health officials. Fifty-eight mammals have now been confirmed with H5N1 avian flu, including fifty-seven sea lions and one otter. The outbreak spans four California counties, with all but seven cases occurring in San Mateo County. Affected seals have displayed abnormal respirations, tremors, and neurologic symptoms since the outbreak began in February, marking the first H5N1 detection in marine mammals in the state.

Beyond U.S. borders, a European surveillance report documents significant activity between November and February. Twenty-five hundred fourteen highly pathogenic avian influenza detections were reported across thirty-two countries in Europe, affecting both domestic and wild birds. Human infections remain rare, with ten cases reported in Cambodia and China during that period and no fatal outcomes recorded. Experts emphasize that human-to-human transmission has not been documented.

Meanwhile, Moderna announced it is moving forward with a large avian influenza study despite earlier funding setbacks from the Department of Health and Human Services. The effort aims to prepare for future avian influenza outbreaks.

Public health officials continue recommending biosecurity measures for poultry owners and farmers. The USDA's Defend the Flock Resource Center provides free guidance, checklists, and videos for maintaining proper biosecurity practices.

Thank you for tuning in to this Bird Flu Update. Be sure to come back next week for more developments in this ongoing story. This has been a Quiet Please production. For more information, check out Quiet Please Dot A I.

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