Australia: NWS & Perth (WA) Report Suspected Positive HPAI H5 Detections

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Overnight Australia has reported two new suspected (preliminarily positive) H5 detections some 3,300 km apart, with one in Perth (WA) and the other on NSW's Bennetts Beach.

The report from New South Wales is particularly concerning, because NSW is the largest poultry producing state in the the country, producing nearly 40% of the nation's chicken meat and 1/3rd of its eggs.  

This from NWS's DPIRD (Department of Primary Industries and Regional Development).

Current situation

New South Wales is currently responding to a suspected positive case of H5 bird flu.

The Giant Petrel, found at Hawks Nest was sampled as a result of a Hotline report and was sent for testing at Elizabeth Macarther Agricultural Institute where it tested positive for H5 bird flu.

Samples have been sent to CSIRO’s Australian Centre for Disease Preparedness (ACDP) for confirmatory testing.

This is the first suspect positive case in NSW.

At this stage, bird flu has not been detected in commercial poultry flocks, captive birds or any other birds in NSW. There is no evidence of any mass mortality in wildlife or spread to other animals.

Confirmed Australian cases to date: Western Australia: 4 confirmed South Australia: 1 confirmed

This strain of avian influenza has had significant impacts overseas, causing widespread mortality in poultry, wild birds and some mammals.

It is important that we all continue to remain vigilant and report any sick or dead poultry, wild birds or wildlife.

If you see multiple sick or dead birds or other animals, do not touch them.

Avoid contact. Record what you see. Report it to the Emergency Animal Disease Hotline on 1800 675 888 from anywhere in Australia.

Australia has well-established national response arrangements in place to respond to animal disease incidents, including H5 bird flu.

The NSW Government is reminding poultry producers that on-farm biosecurity practices are crucial to protect the health of their flocks.

For more information, visit Bird flu (Avian influenza) - DAFF.

NSW's is not only the largest poultry producer in Australia, it is the 2nd in the country for cattle, and 1st in raising sheep.  

If confirmed, this will no doubt raise concerns in New Zealand as well, as it brings the virus much closer to its shores (see New Zealand: DOC to vaccinate ‘at risk’ birds against bird flu).

Meanwhile, Western Australia is testing a bird carcass found on a local beach.

Suspect positive detection of H5 bird flu on northern Perth beach

Media release

 
Western Australia has recorded a suspect positive detection of H5 bird flu in a migratory seabird on a northern Perth beach (between Whitfords and Mullaloo beaches).

Last updated: 3 July 2026

Western Australia has recorded a suspect positive detection of H5 bird flu in a migratory seabird on a northern Perth beach (between Whitfords and Mullaloo beaches).

Samples from a deceased giant petrel were submitted to the Department of Primary Industries and Regional Development (DPIRD) laboratory returning a suspect positive result for H5 influenza in preliminary testing.

The deceased bird was reported on Tuesday (30 June) to the Emergency Animal Disease Hotline.

Samples have been sent to CSIRO’s Australian Centre for Disease Preparedness to confirm the results and determine if it is the H5 bird flu strain of concern.

There have been five confirmed detections of H5 bird flu in Australia, including four in WA and one in South Australia.

All of the detections have involved migratory seabirds that are known to occasionally visit southern Australia.

There is still no evidence of spread or large-scale deaths in local wildlife or any detections in poultry.

The community is encouraged to keep pets away from wildlife, including preventing cats from roaming and keeping dogs on leads in wildlife areas.

The Department of Primary Industries and Regional Development (DPIRD) is leading the response in WA, with a focus on enhanced surveillance and early detection in this investigative phase.

The response is being coordinated across multiple levels of government, involving joint efforts from DPIRD, the Department of Biodiversity, Conservation and Attractions, local governments and other State agencies.

DPIRD will be utilising its team of fisheries officers to conduct increased beach patrols along the metropolitan coast and assist with the surveillance effort.

DPIRD is encouraging the community to continue to report unwell or deceased birds through to the Emergency Animal Disease Hotline on 1800 675 888.

There has been a total of 795 reports from WA to the Emergency Animal Disease (EAD) hotline since Friday 19 June.

Of these reports, 118 have been prioritised by DPIRD based on the risk of H5 bird flu for further investigation or testing.

To date, a total of 58 negative test results have been recorded.

More information is available at birdflu.gov.au

Although the number of reported bird deaths in WA (n=759) far exceeds the testing capacity of local labs - with less than 10% processed to date - the main goal is to detect trends and expansion of the threat. 

Little can be done to prevent the spread of HPAI in the wild, but enhanced surveillance and increased biosecurity by the poultry and livestock industry (cattle/sheep/goats, etc.) can help limit both the spread an economic damage.

While this is the first incursion of HPAI H5N1 into Australia, poultry producers there are no strangers to dealing with avian flu. As recently as 2024-2025 NSW, Victoria, and ACT dealt with a prolonged outbreak of several homegrown H7 viruses. 

Hopefully some of the lessons learned from that encounter will prove helpful in dealing with this newest threat. 

Stay tuned.  

Cyclosporiasis Reports: CDC & Michigan DOH

CDC Reports 145 people with cyclosporiasis
since May 1, 2026

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Every few years we see an outbreak of water and food borne illness here in the United States due to a pair of misery inducing parasites; cyclospora & cryptosporidium.  A few past blogs:

MMWR: More Tales From The Crypto (2019)

CDC HAN: Increased Cyclospora Infection, United States, Summer 2017

MMWR: Cyclosporiasis Outbreak Summer 2013

While Cyclosporiasis is currently making the rounds, Cryptosporidiosis still leads the pack, with an EID study published in early 2011 estimating 750,000 Crypto infections in the U.S. each year (see Foodborne Illness Acquired in the United States—Major Pathogens), although only about 8,000 are laboratory confirmed.

 

While fairly common in developing tropical, or sub-tropical countries, Cyclosporiasis – an infection usually acquired through consuming food or water contaminated with Cyclospora cayetanensis - is relatively rare in the United States.

This is because hosts infected with Cyclospora shed unsporulated (non-infective) cysts in their stool which require days or even weeks to mature into infectious agents. Infection is characterized by prolonged bouts of watery diarrhea, which may persist or reoccur over a period of weeks.

We tend to see non-travel acquired Cyclospora cases in the United States during the summer months, usually peaking in June or July.

 

In recent weeks several states have reported an uptick in Cyclosporiasis, as reported yesterday by the CDC.

Surveillance of Cyclosporiasis

For Public Health
July 1, 2026

Key points

• Cyclosporiasis is caused by several species of the microscopic parasite Cyclospora.
• Cyclosporiasis is a nationally notifiable disease.
• CDC has received reports of 145 cases of cyclosporiasis acquired in the United States of people who became sick from May 1, 2026, through June 16, 2026.
• There is currently no evidence of a single, multistate Cyclospora outbreak linking all cases. Rather, this is a surveillance count of cases across the United States. Investigations to identify potential clusters and potential sources of illness are ongoing.

Although it doesn't show up in yesterday's CDC's update (July 1st), Michigan's Department of Health and Human Services published a press release yesterday that more than doubles the CDC's count; announcing an additional 170 cyclosporiasis infections over the past 9 days.

Outbreak of cyclosporiasis occurring in Michigan

July 01, 2026

No cause identified for illnesses at this time; state offers prevention tips

LANSING, Mich. - The Michigan Department of Health and Human Services (MDHHS) and Michigan Department of Agriculture and Rural Development (MDARD), in partnership with several local health departments, are actively investigating a large and growing outbreak of cyclosporiasis, a diarrheal illness.

As of Tuesday, June 30, more than 170 cases have been reported in Monroe, Lenawee, Washtenaw, Wayne, Livingston, Shiawassee and Jackson counties in the past nine days. Typically, Michigan only identifies around 50 cyclosporiasis cases per year.

“Outbreaks of cyclosporiasis have been occurring across the United States and now here in Michigan,” said Dr. Natasha Bagdasarian, chief medical executive. “Based on the unusual number of cases we have identified in a little over a week, we anticipate additional cases of illness being reported. We recommend Michiganders contact their health care provider if they experience sudden, ongoing diarrhea and reach out to their local health department if additional members of their family are suffering from the same symptoms.”

Cyclosporiasis is caused by infection with the parasite Cyclospora cayatenensis, which is commonly found in developing countries and spread by food or water contaminated with feces. In recent years, outbreaks have occurred in the U.S. as a result of eating contaminated fresh produce, especially during the summer months. Cyclosporiasis is not known to spread from person to person. Symptoms occur two to 14 days after exposure and may include: Frequent watery diarrhea. Loss of appetite and weight. Abdominal cramps and bloating. Nausea (vomiting is less common). Low-grade fever.

Individuals experiencing sudden gastrointestinal illness are encouraged to be evaluated by a health care provider. Symptoms of cyclosporiasis can be significantly improved with antibiotic treatment. If untreated, the illness may last for a few days to a month or longer. Providers are urged to consider cyclosporiasis among patients presenting with acute gastrointestinal illness in southeast Michigan.

“MDARD is committed to ensuring food safety across the state and is working in partnership with local health departments to identify the source of the outbreak and keep consumers safe,” said Jennifer Bonsky, Director of the Human Food Division at MDARD. “In these moments, it becomes even more important to follow all of the essential food preparation guidelines, such as washing your hands before and after preparing food and washing produce before it is consumed.”

To help avoid any illness from cyclospora or other harmful bacteria or organisms, MDARD recommends the following: Wash all fruits and vegetables thoroughly under running water before eating, cutting or cooking. Scrub firm fruits and vegetables, such as melons and cucumbers, with a clean produce brush. Cut away any damaged or bruised areas on fruits and vegetables before preparing and eating. Refrigerate cut, peeled or cooked fruits and vegetables as soon as possible.

Not all cases identified in the last nine days may be connected to the outbreak and the public health investigation is ongoing. State and local officials are interviewing cases to try and identify a common exposure and prevent additional illness. Individuals diagnosed with cyclosporiasis are encouraged to talk to health department staff investigating these illnesses to help identify a potential cause. Additional information is available at About Cyclosporiasis | Cyclosporiasis | CDC.

Current case county by county as of Tuesday, June 30: Monroe: 70 Lenawee: 33 Washtenaw: 21 Wayne: 12 Jackson: 7 Shiawassee: 7 24 cases in 11 other counties and the City of Detroit.

Age Age range: 8 years to 84 years Average age: 44.3 years Median age: 41 years

Given the report from Michigan, it would not be surprising if we start hearing of more cases from other states.  

In the meantime, to help prevent infection, the CDC recommends:

Prevention tips

People can take the following food and vegetable handling recommendations to prevent foodborne illness related to fresh produce:

Wash

• Wash hands with soap and water before and after handling or preparing raw fruits and vegetables.

Prepare

• Wash all fruits and vegetables thoroughly under running water before eating, cutting, or cooking.
• Fruits and vegetables that are labeled "prewashed" do not need to be washed again at home.
• Scrub firm fruits and vegetables, such as melons and cucumbers, with a clean produce brush.
• Cut away any damaged or bruised areas on fruits and vegetables before preparing and eating.

Store

• Refrigerate cut, peeled, or cooked fruits and vegetables as soon as possible (within two hours).

New Zealand: DOC to vaccinate ‘at risk’ birds against bird flu

 
Credit Wikipedia


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Although Australia's confirmed H5N1 count remains at 5 birds - with the furthest east very near Adelaide, in South Australia - New Zealand is watching these developments with understandable concern. 

While lying some 1,600 miles east of Australia, avian flu has been carried across much larger expanses of open water. Two years ago H5N1 arrived in Hawaii, one of the most isolated (by distance) population centers in the world. 

Today New Zealand's Department of Conservation announced an ambitious plan to begin vaccinating a limited number of rare, `at risk' bird populations against H5N1. This plan was telegraphed last summer by that agency in `DOC’s bird flu vaccine trial a success', which reported:

`An internationally significant research trial carried out by DOC shows vaccination can safely be used to protect some of our most threatened birds from virulent bird flu, should it arrive here.'

First the DOC statement, after which I'll have a bit more.

DOC to vaccinate ‘at risk’ birds against bird flu

DOC is set to begin vaccinating some of New Zealand’s most threatened bird species to protect them against the highly virulent strain of H5N1 bird flu, in case it arrives here.

Date: 02 July 2026

H5N1 has been spreading around the world and has caused large die-offs in wild birds, seals and sea lions, as well as farmed poultry.

This bird flu strain is not in New Zealand but has recently been detected in migratory seabirds in Australia, which is a trigger to start vaccinating some of our most critically endangered birds as a safeguard.

DOC is working with the Ministry for Primary Industries (MPI), the Ministry of Health and Health New Zealand | Te Whatu Ora as part of a One Health approach to prepare for the possible arrival of H5N1 in New Zealand.

Last year DOC completed a world-first research trial on five native bird species that showed vaccination is safe and effective in these birds and will help protect them from bird flu.

Vaccination will begin with these five birds – kākāpō, takahē, tchūriwat’/tūturuatu/shore plover, kakī/black stilt and kākāriki karaka/orange-fronted parakeet.

About 300 core breeding birds from the five species will be vaccinated. These birds are in captivity or, in the case of kākāpō and takahē, on offshore islands.

DOC Senior Science Advisor and wildlife vet, Dr Kate McInnes, says these species were chosen because they have small populations that could be at risk and are reliant on intensive conservation efforts for their ongoing survival.

“We’re in a unique position to be able to vaccinate some of our most vulnerable birds as a precaution before H5N1 bird flu potentially arrives here.

“We’ve seen the devastating impacts of this virus on wildlife in other parts of the world, and we want to reduce the risk to our precious native birds where we can.

“It won’t be possible to vaccinate all endangered birds if bird flu arrives, but we can focus on those species where the full two doses of the vaccine can be safely given to achieve protection.”

Kate McInnes says over the past four years DOC has been researching and drawing on overseas evidence and experience to develop a vaccination plan for the New Zealand situation.

A team of DOC vets and specially trained staff will administer the vaccine, supported by species rangers and facilities staff. The work will start this month to avoid the breeding season and give birds time to develop full immunity before spring.

MPI has approved the vaccination plan for the five species and the release of the avian influenza vaccine for the programme to begin. The vaccine contains dead virus and cannot cause bird flu infection.

The vaccination programme is part of DOC’s broader plans to mitigate risks to threatened wildlife and public conservation land should H5N1 bird flu arrive in New Zealand. DOC has worked closely with iwi, species recovery groups, wildlife facilities and conservation groups to get their input into its bird flu response plans.

Early detection of H5N1, if it arrives here, will be crucial. We are asking everyone to be alert when outdoors.

People who spend time outdoors – including tramping, duck hunting and bird watching – can form good habits now that will help protect wildlife if bird flu arrives here. Keep your distance from sick or dead wildlife, keep your gear clean, and know when to report.

Please report groups of three or more sick or dead birds, marine mammals or other wildlife to the MPI exotic pest and disease hotline: 0800 80 99 66.

Do not touch, handle or collect dead or dying birds to avoid spread of the virus and protect yourself.

 

Regular readers will recall that three years ago the U.S. Fish & Wildlife Service issued a statement announcing that HPAI Was Confirmed As Cause Of Death For 3 California Condors found in Northern Arizona.

Ten days later that number had risen to 20. 

With fewer than 500 birds in existence, the USFWS & USDA began studying the feasibility of vaccinating captive (and released) condors against H5N1. 

Details on this program can be found at EID Journal: Safety and Immunogenicity of Poultry Vaccine for Protecting Critically Endangered Avian Species against HPAI Virus, United States.

In recent years, we've also seen a number of zoos around the world use H5 vaccines to protect rare, captive birds (see Research project: vaccination of zoo birds against highly pathogenic avian influenza).

Eighteen months ago, in Nature Reviews: The Threat of Avian Influenza H5N1 Looms Over Global Biodiversity, we looked at the massive, and often underappreciated, impact of HPAI H5 on both avian and mammalian wildlife around the globe.

While numbers are impossible to quantify, hundreds of millions of wild and captive birds have died, and hundreds of thousands - perhaps millions - of wild mammals have succumbed to the virus.

Despite heavy losses, most of these species will survive their encounter with HPAI H5, but for some rare, endangered populations, H5N1 could be an extinction level event. 

Hopefully, programs like these will limit those risks.  

Texas: Screwworm Detections (n=29) Spread to 12 Counties

 

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Since our last update (Saturday), the USDA has added 3 more screwworm detections (in 2 new Texas counties; Pecos & Uvalde), bringing the total to 29.

So far, the parasite has been detected in 17 cattle, 7 sheep, 3 goats, and 2 dogs. No detections in wildlife have been reported, but surveillance is quite limited. 

Complicating matters, across the border in Mexico, the screwworm continues to spread north, potentially providing additional reinforcements for the first arrivals to U.S. soil. 

During the month of June, there were 112 screwworm reports within 100 miles of the Texas border. 

Given the short life cycle of the New World Screwworm(see below) we are likely already well into the second generation in Texas. And each new arrival only exacerbates the problem. 

Reportedly, the USDA dispersing between 4 and 8 million sterile screwworm flies per week into the known infested counties of Texas, but the plan is to expand those  numbers 10-fold by 2027.

Meaning this fight isn't going to be won overnight. 

USDA Reports Another H5N1 Outbreak at a Live Bird Market (Pennsylvania)

 

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Although the summer is generally a very slow time of the year for avian flu reports, the USDA reported yesterday the 3rd detection of H5N1 in a U.S. Live Bird Market for the month of June; this time in Delaware County, Pennsylvania.

Earlier this month we looked at outbreaks in New Jersey and Rhode Island. So far in 2026, 14 markets across 5 states (New York, Pennsylvania, Florida, Rhode Island, and New Jersey) have reported outbreaks.

Graphic created by Gemini

Going back 4 years we find 78 reports across 7 states (New York, Pennsylvania, Florida, Rhode Island, New Jersey, Virginia, and California). 

As we discussed at some length yesterday, in One Health: Mapping reported modes of transmission of HPAI A (H5N1) to humans: A scoping review, live bird markets have traditionally played a large role in the spread (and evolution) of avian flu viruses. 

Curiously, while three mid-atlantic state live bird markets have reported outbreaks in June, the USDA lists zero outbreaks in commercial poultry in RI, PA, or NJ (or any adjacent states) in the past 90 days. 

The most recent ones I can find are April 1st (WOAH poultry) or March 27th (Commercial poultry), both in Pennsylvania. 

While government agencies are quick to reassure the public that the risk of contracting avian influenza remains low in the United States, exposure to live birds (via LBMs or raising poultry) is a known risk factor.

Which makes this apparent stealthy transmission of HPAI in live market birds a concern. 

One Health: Mapping reported modes of transmission of HPAI A (H5N1) to humans: A scoping review

 

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Over the past 2 decades we've seen dozens of suspected ways that HPAI has transmitted to humans. While most have involved direct contact with an infected bird or animal, some have come from (direct or indirect) environmental exposures, and a few appear to have come from close contact with an infected human.

Due to the risks involved, the CDC has issued PPE guidance for both commercial and backyard raisers of poultry (and dairy workers), but it isn't clear how many are following this advice.

There are reportedly more than 11 million backyard poultry flocks in the United States, and tens of millions more in Europe and Asia. That's a lot of opportunities for spillovers. 

We've seen at least 2 fatalities linked to raising backyard birds in the United States (see H5N5 in Washington State and H5N1 in Louisiana, and there are a number of cases where we simply don't know the exposure. 

Many cases around the globe have been linked either to the slaughter, preparation, or consumption of poultry, as was mentioned in this recent report from the WHO:

Human infection with avian influenza A(H5N6) virus

From 1 to 7 May 2026, one new case of human infection with avian influenza A(H5N6) virus was reported to WHO in the Western Pacific Region. The case is a 55-year-old female from Chongqing Municipality, China, with symptom onset on 16 April 2026. She developed severe pneumonia, was hospitalised on 23 April, and died on 3 May. She had purchased, slaughtered, and consumed poultry. Samples collected from a cutting board tested positive for influenza A (H5). All close contacts tested negative and developed no symptoms.

Yet live bird markets flourish around the world, including here in the United States (see NJ & RI Both Report H5N1 in Live Markets), despite repeated calls for their closure (see Interventions in live poultry markets for the control of avian influenza: A systematic review).

In 2022 we looked at Zoonoses & Public Health: Aerosol Exposure of Live Bird Market Workers to Viable Influenza A/H5N1 and A/H9N2 Viruses, Cambodia, and we've seen cases whose likely exposures were cited as simply living near, or walking past an LBM (see J. Infection: Aerosolized H5N6 At A Chinese LBM (Live Bird Market)).

These risks go far beyond just human exposure, of course, as live markets also bring together different types of birds which may also silently carry LPAI viruses like H3N2, H9N2, and H6N1, which could reassort with HPAI H5.

While many of these reports are anecdotal, or inconclusive, the reality is more than 1,000 people have been infected with H5N1, and it behooves us to understand the risks if we hope to avoid many more in the future. 

To that end we have a lengthy scoping review on the modes of transmission of the H5 virus to humans, one that includes a small - but significant - number of suspected human-to-human transmissions. 

Due to its length, I've only posted the Abstract. Follow the link to read it in its entirety.  I'll have a bit more after the break.

Mapping reported modes of transmission of highly pathogenic avian Influenza A (H5N1) to humans: A scoping review

 Nicole Billias a b c, Victoria D’Alessandro a b, Dimitra V. Pouliopoulou a b, Jessica J. Wong a b h, Erin Miller a, Jessica P. Hopkins d e f, Eleni C. Boutsikari g, Lauren Cipriano h, Tiago da Veiga Pereira i, Jennie Johnstone j, Saverio Stranges k l m n, J. Scott Weese o, Joy C. MacDermid a b c, Kieran L. Quinn d, David Fisman d, Pavlos Bobos a b k 
  
https://doi.org/10.1016/j.onehlt.2026.101492 

         PDF  

Abstract

Background

Highly Pathogenic Avian Influenza A (subtype H5N1) poses a threat to human health, and its pandemic potential emphasizes the need to better understand detailed reported transmission pathways to humans. Existing literature is outdated or lacks detailed, comprehensive analysis of the range of transmission routes and how the virus may enter the human body.

Objective

To comprehensively map all reported H5N1 transmission pathways to humans, as well as viral entry routes.

Methods

CINAHL, Embase, MEDLINE, Scopus, PubMed, grey literature, and reference lists (of included studies) were searched up to October 29th, 2025, with no language restrictions. Observational studies and grey literature reporting H5N1 transmission evidence to humans were included. Two reviewers conducted duplicate screening independently. One reviewer completed data extraction, which was cross-verified for accuracy by a second. Findings were summarized narratively.

Results

120 sources met inclusion criteria (70 studies, 50 grey literature). Reported H5N1 transmission pathways were classified into animal-to-human (111 of 120 sources, 92.5%; including poultry-to-human in 102 sources [85.0%] and cattle-to-human in nine sources [7.5%]), environment-to-human (37 of 120 sources, 30.8%), and human-to-human (14 of 120 sources, 11.7%).

Reported transmission pathways were further classified as direct or indirect contact, synthesized, and linked to suspected routes of human entry, including mucosal entry (eyes, nose, mouth), inhalation of aerosols or droplets, ingestion, and percutaneous exposure. Entry routes are biologically plausible and do not imply relative likelihood or causal attribution.

Conclusions 

There are multiple reported pathways of H5N1 exposure, and a single pathway may involve multiple ways to infect humans. Further research is needed to determine causal mechanisms, identify specific risk factors and measures of association, and strengthen evidence-based prevention strategies.

        (Continue . . .)

Two years ago the WHO published Interim Guidance to Reduce the Risk of Infection in People Exposed to Avian Influenza Viruses, which lists a number of `risk factors', including:

• keep live poultry in their backyards or homes, or who purchase live birds at markets;

• slaughter, de-feather and/or butcher poultry or other animals at home;

• handle and prepare raw poultry for further cooking and consumption;

Given the potential public health threat, it makes sense to try to limit high-risk  exposures - particularly in backyard poultry, live bird markets, and commercial poultry and dairy operations - through better biosecurity and consistent use of PPEs.  

But as we discussed five weeks ago in MMWR: Knowledge, Attitudes, and Practices Regarding Avian Influenza Among Owners of Backyard Flocks, many backyard poultry producers still have limited knowledge of avian flu symptoms and risks, and their biosecurity & PPE  measures often fall short of recommendations.

Commercial poultry operations and dairy farms have been similarly reluctant or slow to fully implement biosecurity and PPE recommendations, and surveillance and reporting remains passive and incomplete.

And as for the public, most remain unconvinced of the seriousness of the  threat (see Two Surveys (UK & U.S.) Illustrating The Public's Lack of Concern Over Avian Flu).

While HPAI H5 many never gain the ability to spread efficiently from human-to-human, we do seem intent on giving it every opportunity to do so.