ETIDIOH - NEW

  {Summary} Time Period: November 23, 2025 - November 29, 2025 -- H5 Detection :  2 site(s) ( 0.6% ) -- No Detection :  352 site(s) ( 99.4% ) -- No samples in last week :  102 site(s) (...) Source:   Link:  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Summary} Time Period: November 16, 2025 - November 22, 2025 -- H5 Detection :  6 site(s) ( 1.4% ) -- No Detection :  410 site(s) ( 98.6% ) -- No samples in last week :  50 site(s) (...) Source:  Link:  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Summary} Confirmed Cases at National Level [National - Total Cases : 71 { +1 }{§}] [Cases -  Exposure Source] -- 41 - Dairy Herds (Cattle){*} -- 24 - Poultry Farms and Culling Operations {*} -- 3 - Other Animal Exposure {†} -- 3 - Exposure Source Unknown {‡} Probable Cases at National Level [National - Total Cases : 7 {no change} ] [Cases -  Exposure Source] -- 1 - Dairy Herds (Cattle) {*} -- 5 - Poultry Farms and Culling Operations {*} --  0 - Other Animal Exposure {†} -- 1 - Exposure Source Unknown {‡} NOTE : One additional case was previously detected in a poultry worker in Colorado in 2022. Louisiana reported the first H5 bird flu death in the U.S. {*} Exposure Associated with Commercial Agriculture and Related Operations {†} Exposure was related to other animals such as backyard flocks, wild birds, or other mammals {‡} Exposure source was not able to be identified (...) {§} A case from Washington State, see more at:  https://doh.wa.gov/newsroom/grays-h...

  {Excerpt} Novel Influenza A Virus Infections Two confirmed human infections with novel influenza A viruses were reported to CDC this week .  One infection with an influenza A(H5N5) virus was reported by the Washington State Department of Health and one infection with an influenza A(H1N2) variant (A(H1N2)v) virus was reported by the Vermont Department of Health. One infection with an influenza A(H5N5) virus was reported by the Washington State Department of Public Health .  -- The case occurred in an individual aged ≥18 years .  -- This individual developed symptoms during the week ending October 25 , 2025 (Week 43) and was hospitalized with their illness during the week ending November 8, 2025 (Week 45).  -- Respiratory specimens collected at the healthcare facility tested positive for influenza A and were presumptive positive for influenza A(H5) at the University of Washington.  -- The specimens were sent to the Washington State Public Health Laboratory ...

  {Summary} Time Period: November 09, 2025 - November 15, 2025 -- H5 Detection :  1 site(s) ( 0.3% ) -- No Detection :  382 site(s) ( 99.7% ) -- No samples in last week :  75 site(s) (...) Source:  Link:  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Excerpt} National situation summary Person-to-person spread :  None -- There is no known person-to-person spread at this time. Current public health risk :  Low -- The current public health risk is Low. Cases in the U.S. :  71 cases Deaths in U.S. :  1 death (...) Situation summary of confirmed and probable human cases since 2024 {Confirmed Cases}:  -- National: Total Cases: 71 {+1} [Cases - Exposure Source] -- 41 - Dairy Herds (Cattle){*} -- 24 - Poultry Farms and Culling Operations{*} -- 3 - Other Animal Exposure{†} -- 3 - Exposure Source Unknown{‡} {Probable Cases}:  -- National: Total Cases: 7 [Cases - Exposure Source] -- 1 - Dairy Herds (Cattle){*} -- 5 - Poultry Farms and Culling Operations{*} -- 0 - Other Animal Exposure{†} -- 1 - Exposure Source Unknown{‡} NOTE : One additional case was previously detected in a poultry worker in Colorado in 2022. Louisiana reported the first H5 bird flu death in the U.S. {*} Exposure Associated with Comm...

  {Summary} Time Period: September 07, 2025 - September 13, 2025 -- H5 Detection :  3 sites ( 0.7% ) -- No Detection :  401 sites ( 99.3% ) -- No samples in last week :  57 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Summary} Time Period: August 31, 2025 - September 06, 2025 -- H5 Detection :  4 sites ( 0.9% ) -- No Detection :  418 sites ( 99.1% ) -- No samples in last week :  43 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

{Summary} Time Period: August 24, 2025 - August 30, 2025 -- H5 Detection :  3 sites ( 0.7% ) -- No Detection :  428 sites ( 99.3% ) -- No samples in last week :  31 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  Summary -- What is already known about this topic? - As of January 1, 2025, 37 human cases of highly pathogenic avian influenza (HPAI) A( H5N1 ) had been detected in California , none of which occurred in San Francisco. -- What is added by this report? - On January 9, 2025, a case of HPAI A(H5N1) infection was identified in a school-aged child in San Francisco through enhanced surveillance (influenza A virus subtyping of a sample of specimens weekly). No source of exposure was identified, and investigations found no laboratory evidence of human-to-human transmission among close contacts. -- What are the implications for public health practice? - Enhanced surveillance and timely subtyping of a subset of influenza A–positive specimens, including specimens from persons without known A(H5N1) exposure, are important to detect avian influenza A virus infections. Public health investigations are critical to monitoring for human-to-human transmission. Abstract In response to a highly pat...

  {Summary} Time Period: August 17, 2025 - August 23, 2025 -- H5 Detection :  2 sites ( 0.5% ) -- No Detection :  429 sites ( 99.5% ) -- No samples in last week :  31 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Summary} Time Period: August 10, 2025 - August 16, 2025 -- H5 Detection :  1 site ( 0.2% ) -- No Detection :  422 sites ( 99.8% ) -- No samples in last week :  37 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Summary} Time Period: August 03, 2025 - August 09, 2025 -- H5 Detection :  2 sites ( 0.5% ) -- No Detection :  425 sites ( 99.5% ) -- No samples in last week :  33 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Summary} Time Period: July 27, 2025 - August 02, 2025 -- H5 Detection :  4 sites ( 0.9% ) -- No Detection :  430 sites (99.1%) -- No samples in last week :  24 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Excerpt} Time Period: July 20, 2025 - July 26, 2025 -- H5 Detection :  4 sites ( 1.0% ) -- No Detection :  391 sites ( 99.0% ) -- No samples in last week :  38 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Excerpt} Time Period: July 13, 2025 - July 19, 2025 -- H5 Detection :  2 sites ( 0.5% ) -- No Detection :  380 sites ( 99.5% ) -- No samples in last week :  47 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Excerpt} Time Period: July 06, 2025 - July 12, 2025 -- H5 Detection :  2 sites ( 0.5% ) -- No Detection :  395 sites ( 99.5% ) -- No samples in last week :  51 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html _____

  {Excerpt} Time Period: June 29, 2025 - July 05, 2025 -- H5 Detection :  2 sites ( 0.6% ) -- No Detection :  330 sites ( 99.4% ) -- No samples in last week :  77 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

  {Excerpt} Time Period: June 22, 2025 - June 28, 2025 -- H5 Detection :  3 sites ( 0.8% ) -- No Detection :  370 sites ( 99.2% ) -- No samples in last week :  52 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/nwss/rv/wwd-h5.html ____

Summary -- What is already known about this topic? - Parvovirus B19 (B19) is a respiratory virus that can cause adverse fetal outcomes in pregnant women and persons who are immunocompromised or have chronic hemolytic blood disorders . After relatively low rates during the COVID-19 pandemic years of 2021–2023, B19 activity in 2024 exceeded that of prepandemic years. -- What is added by this report? - Data from the National Syndromic Surveillance Program indicated that the proportion of sera specimens positive for B19 antibodies during January–May 10, 2025, was higher than during the same period in 2024 , suggesting a sustained increase in B19 transmission. -- What are the implications for public health practice? - Health care providers should have a heightened suspicion of and consider providing testing for B19 infection among groups at high risk for severe outcomes, including pregnant women with compatible symptoms or exposure to B19. Among pregnant women, health care providers should ...