Bird Flu Tracker Avian Influenza A H5N1

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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# Bird Flu Update

Health authorities across the United States continue monitoring avian influenza activity as new cases emerge in livestock and poultry operations. The CDC reports no new human cases of bird flu this week, maintaining the current situation where human-to-human transmission of H5 virus has not been identified in the United States.

On the animal front, Idaho dairy herds have tested positive for H5N1 avian flu, marking the first cattle detections since December 2025. According to the USDA Animal and Plant Health Inspection Service, over the past 30 days, 41 confirmed avian flu outbreaks were documented across domestic flocks, including 27 in commercial settings and 14 in backyard premises, affecting 1.6 million birds. Recent commercial poultry operations reporting outbreaks include facilities in South Dakota and Arkansas, with the Arkansas outbreak impacting over 191,000 broiler chickens.

In Southeast Georgia, a highly pathogenic avian influenza case was confirmed in a backyard flock of approximately 60 birds in Pierce County. Officials believe the virus likely came from contact with wild birds. The flock has been depopulated to prevent further spread, with no commercial poultry or dairy operations within six miles of the affected site.

On the vaccine front, Moderna announced Tuesday that the first participants in the United States and United Kingdom have received doses in a Phase 3 trial of its H5 messenger RNA vaccine candidate, mRNA-1018. The study aims to enroll about 4,000 healthy adults. This development comes after the Trump administration canceled hundreds of millions in government contracts with Moderna in May 2025. The Coalition for Epidemic Preparedness Innovations has since stepped in with up to 54.3 million dollars in funding support. Notably, most trial work is taking place in the United Kingdom, with 3,000 of 4,000 volunteers and 26 of 36 trial sites located there.

Meanwhile, the CDC reports that seasonal influenza activity continues to decrease nationwide. The agency estimates at least 31 million illnesses, 380,000 hospitalizations, and 23,000 deaths from seasonal flu during the current 2025-2026 season. Approximately 135 million doses of influenza vaccine have been distributed across the United States.

Thank you for tuning in to this bird flu update. Be sure to come back next week for more developments. This has been a Quiet Please production. For more information, check out Quiet Please dot A I.

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A Washington state resident, an older adult with underlying health conditions, has died from a rare H5N5 bird flu strain, marking the first U.S. human case since February and the first of this type ever reported in humans, according to CBS News health officials. This comes amid ongoing H5N1 outbreaks ravaging U.S. livestock, with the USDA's Animal and Plant Health Inspection Service confirming avian flu in five Idaho dairy herds this week, the first cattle detections since December 2025 in Wisconsin, CIDRAP reports. Over the past 30 days, 41 outbreaks hit domestic flocks, killing 1.6 million birds across 27 commercial and 14 backyard sites.

In the last 24 hours, no new human bird flu cases were reported in the U.S. or globally, per CDC's weekly surveillance and health monitoring updates, with H5N1 remaining stable and no person-to-person transmission identified. Poultry losses continue, including new cases in South Dakota turkey facilities affecting 60,000 birds, one Arkansas broiler site with 191,200 birds, a Georgia backyard flock in Pierce County, and spreading threats in Indiana, as noted by AgWeb and Farm Progress.

Policy shifts dominate headlines: HHS Secretary Robert F. Kennedy Jr. canceled $766 million in Moderna funding for mRNA bird flu vaccines, calling off $500 million in related projects amid warnings that vaccines could turn birds into mutant factories, CBS News details. Over 100 federal bird flu tracking scientists, including vaccine and food safety experts, were laid off, alongside FDA veterinary lab cuts, raising alarms as the virus hits dairy herds and drives up egg prices ahead of Easter.

Mexican authorities reported a 3-year-old girl's death from bird flu, while a Canadian ostrich farm lost its Supreme Court battle against culling. Experts urge vigilance, with research probing virus mutations and air monitoring for surges.

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