#Uruguay - #Influenza A H5 viruses of high pathogenicity (Inf. with) (non-poultry including wild birds) (2017-) - Follow up report 1

 

    ° Following a suspicion regarding deaths among birds of various species, the Official Veterinary Service (SVO) launched an epidemiological investigation in a backyard in the Department of Colonia. 

    ° In the backyard there were birds of different species: hens (Gallus gallus domesticus), geese (Anser anser), and guinea fowl (Numida meleagris), which were raised outdoors and had contact with migratory wild birds. 

    ° Rapid tests came back negative, but samples were sent to the official laboratory to confirm the results, and they tested positive via PCR. 

    ° The SVO is currently conducting an epidemiological investigation in the zone. 

    ° On September 4, 5, and 6, the SVO conducted the epidemiological investigation in the area. 

    ° Activities included coordination, geographic delineation of the outbreak, establishment of a 5-kilometer operational radius, stamping out, sampling of birds, epidemiological investigation, and classification of establishments according to their risk level. 

    ° On September 5 and 6, 34 establishments within a 5-kilometer radius of the outbreak were inspected and identified. 

    ° No cases with compatible signs or mortality were reported within these establishments, nor were any commercial poultry farms listed in this area.

Source: 

Link: https://wahis.woah.org/#/in-review/7810

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, Sept. 4 '26)

 

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A(H5) detections in the past week

Time Period: August 23, 2026 - August 29, 2026

    -- A(H5) Detection: 3 site(s) (0.7%)

    -- No Detection: 439 site(s) (99.3%)

    -- No samples: 74 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#USA, #Wastewater Data for Avian #Influenza #H5 (US CDC, August 28 '26)

 

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A(H5) detections in the past week

Time Period: August 16, 2026 - August 22, 2026

    -- A(H5) Detection: 3 site(s) (0.7%)

    -- No Detection: 437 site(s) (99.3%)

    -- No samples: 72 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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A cross-sectional #study of avian #influenza virus in #poultry #markets of #Guangdong #China, 2025

 

Abstract

Background: 

Guangdong, China is a critical epicenter for avian influenza virus (AIV) emergence, where H5N1 and highly pathogenic H7N9 were first identified. Monitoring AIV genotype distribution and genetic diversity in this region is essential for providing early warnings and mitigating the risk of human infections.

Methods: 

In May 2025, a cross-sectional study was conducted across 4 representative cities in Guangdong. We collected 500 environmental swabs and 45 wastewater samples from 23 live poultry markets (LPMs). Samples were screened for influenza A virus (IAV) and subtyped for H5, H7, and H9. Next generation sequencing (NGS) and phylogenetic analyses were employed to characterize viral diversity and zoonotic potential.

Results: 

AIV was detected in 49.2% (246/500) of environmental samples. H9 was the dominant subtype (38.2%), followed by H5 (3.2%) and H7 (0.8%); 2.4% of positive samples showed multi-subtype co-occurrence. “Non-restricted zone” markets (80.0%) and “waste storage areas” (68.4%) were identified as primary contamination hotspots. Phylogenetic analysis revealed that H5 and H9 viruses are accumulating mutations linked to enhanced human-type receptor affinity. Notably, H5 and H6 sequences exhibited long internal branches and clustered with isolates from other Asian countries rather than domestic strains, highlighting a significant gap in current domestic molecular surveillance and a lack of continuous evolutionary data for these genotypes.

Conclusions: 

Widespread AIV contamination persists in Guangdong LPMs, dominated by H9 with low-level circulation of highly pathogenic subtypes. The identified surveillance gaps for H5/H6 and the presence of multi-subtype environments underscore the urgent need for strengthened, integrated molecular monitoring and stricter market regulation to mitigate public health risks.

Source: 

Link: https://www.frontiersin.org/journals/cellular-and-infection-microbiology/articles/10.3389/fcimb.2026.1914072/full

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Highly persistent #antibody levels but limited population #immunity in #gannets after #HPAI #outbreak

 

Abstract

The recent large-scale circulation of High Pathogenicity Avian Influenza (HP AI) viruses H5Nx of clade 2.3.4.4b has been responsible for massive die-offs in wild species, notably in long-lived seabirds, with unknown implications for the immunity of surviving individuals. In the North Atlantic, northern gannet colonies were heavily affected in 2022, with more than 40% mortality observed among breeding adults and some surviving individuals developing dark irises. Using samples collected in 2023 and 2024 on Rouzic colony (France), we report persistent individual anti-AI antibody levels and seroneutralisation titres, with most of the immune individuals showing dark irises. A modelling approach further stressed the importance of long-lasting immunity in such species by showing that the proportion of individuals which kept their immunity between years strongly limited decreases in population size in case of repeated outbreaks. Overall, our results highlight the existence and importance of long-lasting immunity in long-lived species for population persistence.

Competing Interest Statement

The authors have declared no competing interest.

Funder Information Declared

CNRS Ecology Evolution SEE-Life program for long term monitoring

Ceva Wildlife Research Fund, CWR1

Agence Nationale de la Recherche, https://ror.org/00rbzpz17, ECOPATHS (ANR-21-CE35-0016), WILDFLU (ANR-25-CE35-0691)

Ailes Marines

Observatoire de Recherche Montpelliérain de l'Environnement OREME, https://ror.org/00cesps27, SO ECOPOP

Source: 

Link: https://www.biorxiv.org/content/10.64898/2026.08.25.745523v1

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#USA, #Wastewater Data for Avian #Influenza #H5 (US CDC, August 21 '26)

 

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A(H5) detections in the past week

Time Period: August 09, 2026 - August 15, 2026

    -- A(H5) Detection: 2 site(s) (0.5%)

    -- No Detection: 426 site(s) (99.5%)

    -- No samples: 79 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#Wastewater Data for Avian #Influenza #H5 (US CDC, August 14 '26)

 

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A(H5) detections in the past week

Time Period: August 02, 2026 - August 08, 2026

    -- A(H5) Detection: 5 site(s) (1.2%)

    -- No Detection: 422 site(s) (98.8%)

    -- No samples: 88 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#USA, #Wastewater Data for Avian #Influenza #H5 (US CDC, August 7 '26)

 

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A(H5) detections in the past week

Time Period: July 26, 2026 - August 01, 2026

    -- A(H5) Detection: 7 site(s) (1.6%)

    -- No Detection: 440 site(s) (98.4%)

    -- No samples: 66 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, July 31 '26)

 

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A(H5) detections in the past week

Time Period: July 19, 2026 - July 25, 2026

    -- A(H5) Detection: 4 site(s) (0.9%)

    -- No Detection: 427 site(s) (99.1%)

    -- No samples: 81 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, July 24 '26)

 

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A(H5) detections in the past week

Time Period: July 12, 2026 - July 18, 2026

    ° A(H5) Detection: 10 site(s) (2.4%)

    ° No Detection: 414 site(s) (97.6%)

    ° No samples: 89 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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Evolving #dynamics of #H5Nx avian #influenza in #China revealed by long-term wild bird #surveillance

 

Abstract

H5Nx highly pathogenic avian influenza viruses pose persistent threats to poultry, wildlife, and public health. Over the past two decades, their geographic and host ranges have expanded across migratory networks whose epidemiological connectivity has become increasingly apparent through recent surveillance and genomic analyses. To elucidate these dynamics, we conduct long-term nationwide wild-bird surveillance in China, integrating active and passive monitoring. Our analyses reveal the maintenance, reassortment, and transmission of H5Nx viruses in wild birds, highlighting the value of sustained surveillance in capturing viral evolution. We identify distinct ecological patterns among major clades, with 2.3.4.4b showing the widest distribution and acting as the main lineage mediating intercontinental spread. Since 2020, most 2.3.4.4b viruses detected in wild birds in China have clustered with lineages originating outside China, consistent with repeated reintroduction rather than sustained local circulation. This shift underscores the growing role of migratory connectivity in shaping global viral exchange and the need for coordinated international active surveillance.

Source: 

Link: https://www.nature.com/articles/s41467-026-76039-9

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Avian #Influenza #Report: July 12 - 18 '26 (Wk 29) (HK CHP, July 21 '26): 1 New #Human Case of Infection with #H5 virus in #Bangladesh

 

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    ° Avian influenza A(H5): 

        § Bangladesh: 

            - Sylhet Division: A child with onset on May 17, 2026. 

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Source: 

Link: https://www.chp.gov.hk/files/pdf/2026_avian_influenza_report_vol22_wk29.pdf

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#USA, #Wastewater Data for Avian #Influenza #H5 (US CDC, July 17 '26)

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A(H5) detections in the past week: Time Period: July 05, 2026 - July 11, 2026

    - A(H5) Detection: 4 site(s) (0.9%)

    - No Detection: 442 site(s) (99.1%)

    - No samples: 46 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, July 10 '26)

 

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Time Period: June 28, 2026 - July 04, 2026

    -- A(H5) Detection: 4 site(s) (0.9%)

    -- No Detection: 439 site(s) (99.1%)

    -- No samples: 49 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, July 6 '26)

 

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Time Period: June 21, 2026 - June 27, 2026

    -- A(H5) Detection: 6 site(s) (1.3%)

    -- No Detection: 453 site(s) (98.7%)

    -- No samples: 33 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#USA, #Wastewater Data for Avian #Influenza #H5 (US CDC, June 26 '26)

 

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Time Period: June 14, 2026 - June 20, 2026

    -- A(H5) Detection: 4 site(s) (0.9%)

    -- No Detection:  455 site(s) (99.1%)

    -- No samples: 32 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#CostaRica - #Influenza A #H5 viruses of high pathogenicity (Inf. with) (non-poultry including wild birds) (2017-) - Immediate notification

 

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By Benjamint444 - Own work, GFDL 1.2, https://commons.wikimedia.org/w/index.php?curid=26540141

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Late in the afternoon of Thursday, June 18 of this year, officials from the National System of Conservation Areas (SINAC) of the Ministry of Environment and Energy (MINAE) found a blue-footed booby at Espadilla Beach in Manuel Antonio, Quepos city. The bird was transferred to the quarantine area of an animal rescue center in Quepos, where it was euthanized on Friday, June 19, and a necropsy was performed to collect samples. These samples were transported by official SENASA personnel to the National Laboratory of Veterinary Services (LANASEVE) on Monday, June 22, and a positive result for highly pathogenic avian influenza type A, H5, was obtained on June 24. As complementary measures, public-private coordination strategies have been established to strengthen epidemiological surveillance, promote the reporting of suspected cases nationwide, and reinforce biosecurity measures. To date, there is no evidence of disease transmission to domestic birds.

Source: WOAH, https://wahis.woah.org/#/home

Link: https://wahis.woah.org/#/in-review/7657

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, June 22 '26)

 

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Time Period: June 07, 2026 - June 13, 2026

    -- A(H5) Detection: 4 site(s) (0.9%)

    -- No Detection: 442 site(s) (99.1%)

    -- No samples: 47 site(s)

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Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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#Denmark - #Influenza A #H5 viruses of high pathogenicity (Inf. with) (non-poultry including wild birds) (2017-) - Immediate notification

 

According to article 10.4.1.4 of the Terrestrial Animal Health Code, Member Countries should not impose bans on the trade in poultry commodities in response to notification on the presence of any influenza A virus in birds other than poultry.

A wild black-headed gull in Stevns.

Source: 

Link: https://wahis.woah.org/#/in-review/7614

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, June 12 '26)

 

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Time Period: May 31, 2026 - June 06, 2026

    -- A(H5) Detection: 3 site(s) (0.7%)

    -- No Detection: 440 site(s) (99.3%)

    -- No samples: 52 site(s)

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(...)

Source: 

Link: https://www.cdc.gov/wastewater/emerging-viruses/h5.html?

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