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

 

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Time Period: April 05, 2026 - April 11, 2026

-- A(H5) Detection: 6 site(s) (1.3%)

-- No Detection: 454 site(s) (98.7%)

-- No samples: 103 site(s)

(...)

Source: 

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

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

 

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Time Period: March 29, 2026 - April 04, 2026

-- A(H5) Detection: 7 site(s) (1.6%)

-- No Detection: 430 site(s) (98.4%)

-- No samples: 125 site(s)

(...)

Source: 

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

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#USA, Weekly #US #Influenza #Surveillance #Report: Key Updates for Week 13, ending April 4, 2026 (#CDC, summary)

 

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Key Points

-- Seasonal influenza activity continues to decrease in most areas of the country. 

- Influenza A activity is low across all HHS regions while the amount of and trends in influenza B activity vary by region.

-- Influenza A(H3N2) viruses are the most frequently reported influenza viruses overall this season.

-- Among 2,166 influenza A(H3N2) viruses collected since September 28, 2025, that underwent additional genetic characterization at CDC, 92.8% belonged to subclade K.

-- The cumulative influenza-associated hospitalization rate overall in FluSurv-NET is the third highest since the 2010-2011 season. 

- Children younger than 18 years have the second highest cumulative hospitalization rate for that age group since the 2010-2011 season.

-- Twelve influenza-associated pediatric deaths occurring during the 2025-2026 season were reported to CDC this week, bringing the season total to 139 reported influenza-associated pediatric deaths.

-- Among children who were eligible for influenza vaccination and with known vaccination status, approximately 85% of reported pediatric deaths this season have occurred in children who were not fully vaccinated against influenza.

-- CDC's in-season severity assessment framework classified the season as moderate across all ages. 

- CDC also assesses severity by three age groups: pediatric (0-17 years), adult (18-64 years), and older adults (≥65 years). 

- At this point in the season, the pediatric age group is classified as having high severity, while both the adult and older adult age groups are classified as having moderate severity. 

- These assessments are conducted each week during the season, and the season's severity assessment can change if activity should increase again.

-- CDC estimates that there have been at least 31 million illnesses, 370,000 hospitalizations, and 23,000 deaths from flu so far this season.

-- Influenza (flu) vaccination has been shown to reduce the risk of flu and its potentially serious complications. 

- There is still time to get vaccinated against flu this season. 

- Approximately 135 million doses of influenza vaccine have been distributed in the United States this season.

-- There are prescription flu antiviral drugs that can treat flu illness; those should be started as early as possible and are especially important for patients at higher risk for flu-related complications.1

-- Influenza viruses are among several viruses contributing to respiratory disease activity. CDC provides updated, integrated information about COVID-19, flu, and respiratory syncytial virus (RSV) activity on a weekly basis.

-- No new avian influenza A(H5) infections were reported to CDC this week. To date, person-to-person transmission of influenza A(H5) viruses has not been identified in the United States.

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Source: 

Link: https://www.cdc.gov/fluview/surveillance/2026-week-13.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, April 3 '26)

 

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Time Period: March 22, 2026 - March 28, 2026

-- H5 Detection: 8 site(s) (1.7%)

-- No Detection: 458 site(s) (98.3%)

-- No samples in last week: 105 site(s)

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Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, March 27 '26)

 

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Time Period: March 15, 2026 - March 21, 2026

-- H5 Detection: 9 site(s) (2.0%)

-- No Detection: 436 site(s) (98.0%)

-- No samples in last week: 130 site(s)

(...)

Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, March 20 '26)

 

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Time Period: March 08, 2026 - March 14, 2026

-- H5 Detection: 8 site(s) (1.8%)

-- No Detection: 444 site(s) (98.2%)

-- No samples in last week: 120 site(s)

(...)

Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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Early #Detection and #Surveillance of the #SARS-CoV-2 #Variant #BA32 — Worldwide, November 2024–February 2026 (US CDC, MMWR, March 19 '26)

 

Summary

-- What is already known about this topic?

- CDC tracks SARS-CoV-2 variants internationally using digital public health surveillance and in the United States using genomic surveillance, including wastewater and traveler-based surveillance. 

- The highly divergent SARS-CoV-2 variant BA.3.2 was first detected in a respiratory sample collected on November 22, 2024, in South Africa.

-- What is added by this report?

- As of February 11, 2026, BA.3.2 had been reported in 23 countries. 

- Detections began increasing in September 2025. 

- In the United States, BA.3.2 was detected in nasal swabs from four travelers, three airplane wastewater samples, clinical samples from five patients, and 132 wastewater samples from 25 U.S. states.

-- What are the implications for public health practice?

- Monitoring the spread of BA.3.2 provides valuable information about the potential for this new SARS-CoV-2 lineage to evade immunity from a previous infection or vaccination.

Abstract

The SARS-CoV-2 variant BA.3.2 was first identified in South Africa on November 22, 2024. BA.3.2 has approximately 70–75 substitutions and deletions in the gene sequence of the spike protein relative to JN.1 and its descendant, LP.8.1, the antigens used in the 2025–26 COVID-19 vaccines. CDC is using a multimodal SARS-CoV-2 genomic surveillance approach to monitor the emergence and spread of BA.3.2 and other SARS-CoV-2 variants internationally and within the United States. The first U.S. BA.3.2 detection occurred on June 27, 2025, through CDC’s Traveler-Based Genomic Surveillance program in a participant traveling to the United States from the Netherlands. The first U.S. detection of BA.3.2 in a clinical specimen collected from a patient was reported on January 5, 2026. As of February 11, 2026, BA.3.2 had been detected in voluntarily self-collected nasal swabs from four U.S. travelers, clinical samples from five patients, three airplane wastewater samples, and 132 wastewater surveillance samples from 25 states. BA.3.2 has been reported by at least 23 countries. SARS-CoV-2 continues to cause substantial morbidity and mortality worldwide. BA.3.2 mutations in the spike protein have the potential to reduce protection from a previous infection or vaccination. Continued genomic surveillance is needed to track SARS-CoV-2 evolution and determine its potential effect on public health.

Source: 

Link: https://www.cdc.gov/mmwr/volumes/75/wr/mm7510a1.htm?s_cid=OS_mm7510a1_e&ACSTrackingID=USCDC_921-DM153709&ACSTrackingLabel=Week%20in%20MMWR%3A%20Vol.%2075%2C%20March%2019%2C%202026&deliveryName=USCDC_921-DM153709

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, March 13 '26)

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Time Period: March 01, 2026 - March 07, 2026

-- H5 Detection: 8 site(s) (1.6%)

-- No Detection: 491 site(s) (98.4%)

-- No samples in last week: 77 site(s)

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Source: US Centers for Disease Control and Prevention, 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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Interim Estimates of 2025–26 Seasonal #Influenza #Vaccine #Effectiveness — #USA, September 2025–February 2026 (CDC MMWR)

 

Abstract

In the United States, annual influenza vaccination has been recommended for all persons aged ≥6 months, including during the 2025–26 season. Interim influenza vaccine effectiveness (VE) estimates were calculated for patients with acute respiratory illness–associated outpatient visits and hospitalizations from three U.S. respiratory virus VE networks during the 2025–26 influenza season, using a test-negative case-control design. Among children and adolescents aged <18 years, VE was 38%–41% against influenza outpatient visits and 41% against influenza-associated hospitalization. Among adults aged ≥18 years, VE was 22%–34% against influenza outpatient visits and 30% against influenza-associated hospitalization. Among children and adolescents, VE against influenza A ranged from 37% (against outpatient visits) to 42% (against hospitalization) across settings; among adults, VE against influenza A ranged from 30% (against hospitalization) to 34% (against outpatient visits) across settings. Among children and adolescents, VE against influenza A(H3N2)–associated outpatient visits was 35% and against influenza A(H3N2)–associated hospitalization was 38%. VE against influenza B outpatient visits ranged from 45%–71% among children and adolescents and was 63% among adults. Other estimates of VE were not statistically significant or were not reportable. Although interim influenza VE is lower during the 2025–26 influenza season than it was during recent influenza seasons, these findings demonstrate that influenza vaccination still provides protection against influenza. CDC recommends influenza vaccination; U.S. influenza vaccines remain available for persons aged ≥6 months.

Source: 

Link: http://dx.doi.org/10.15585/mmwr.mm7509a2

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

 

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Time Period: February 22, 2026 - February 28, 2026

-- H5 Detection: 9 site(s) (2.0%)

-- No Detection: 443 site(s) (98.0%)

-- No samples in last week: 147 site(s)

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Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, Feb. 27 '26)

 

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Time Period: February 15, 2026 - February 21, 2026

-- H5 Detection: 4 site(s) (0.8%)

-- No Detection: 495 site(s) (99.2%)

-- No samples in last week: 110 site(s)

(...)

Source: US CDC, https://www.cdc.gov/

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, Feb. 20 '26)

 

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Time Period: February 08, 2026 - February 14, 2026

-- H5 Detection: 9 site(s) (1.9%)

-- No Detection: 466 site(s) (98.1%)

-- No samples in last week: 171 site(s)

The H5 detections at sewershed IDs 809 and 912 in Michigan are false detections resulting from a data error. These will be corrected in the next update.

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Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (CDC, Feb. 16 '26)

 

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Time Period: February 01, 2026 - February 07, 2026

-- H5 Detection: 8 site(s) (1.7%)

-- No Detection: 475 site(s) (98.3%)

-- No samples in last week: 166 site(s)

The H5 detections at sewershed IDs 809 and 912 in Michigan are false detections resulting from a data error. These will be corrected in the next update.

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Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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

 

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Time Period: January 25, 2026 - January 31, 2026

-- H5 Detection: 4 site(s) (0.9%)

-- No Detection: 458 site(s) (99.1%)

-- No samples in last week: 192 site(s)

The H5 detections at sewershed IDs 809 and 912 in Michigan are false detections resulting from a data error. These will be corrected in the next update.

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Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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Retail #Milk #Monitoring of #Influenza #H5N1 in Dairy #Cattle, #USA, 2024–2025

 

Abstract

US retail milk monitoring during April 13–May 3, 2024, identified influenza A(H5N1) viral RNA in 36% of retail milk samples, indicating widespread undetected infections in US dairy cows. After federal initiatives, reported infections more closely aligned with findings in retail milk during December 27, 2024–January 29, 2025, reflecting improved detection and control.

Source: 

Link: https://wwwnc.cdc.gov/eid/article/32/2/25-1332_article

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, Jan. 30 '26)

 

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Time Period: January 18, 2026 - January 24, 2026

-- H5 Detection: 4 site(s) (0.9%)

-- No Detection: 437 site(s) (99.1%)

-- No samples in last week: 204 site(s)

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Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, Jan. 23 '26)

 

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Time Period: January 11, 2026 - January 17, 2026

-- H5 Detection: 6 site(s) (1.1%)

-- No Detection: 519 site(s) (98.9%)

-- No samples in last week: 78 site(s)

(...)

Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, Jan. 16 '26)

 

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Time Period: January 04, 2026 - January 10, 2026

-- H5 Detection: 8 site(s) (1.5%)

-- No Detection: 541 site(s) (98.5%)

-- No samples in last week: 66 site(s)

(...)

Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, Jan. 8 '26)

 

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Time Period: December 28, 2025 - January 03, 2026

-- H5 Detection: 3 site(s) (0.7%)

-- No Detection: 428 site(s) (99.3%)

-- No samples in last week: 111 site(s)

(...)

Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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#USA, #Wastewater Data for Avian #Influenza #H5 (#CDC, Jan. 5 '26)

 

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Time Period: December 21, 2025 - December 27, 2025

-- H5 Detection: 4 site(s) (1.1%)

-- No Detection: 359 site(s) (98.9%)

-- No samples in last week: 168 site(s)

(...)

Source: 

Link: https://www.cdc.gov/nwss/rv/wwd-h5.html

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