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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Nevada confirmed its first human case of H5N1 bird flu on February 10, 2025, in a dairy worker from Churchill County who had been exposed to infected dairy cows. The worker reported conjunctivitis, was not hospitalized, and had recovered by the time of the CDC’s February 26 update. Officials identified no evidence that the infection spread to other people.
What happened in Nevada?
The Central Nevada Health District confirmed the case on February 10, 2025. Nevada’s health officer report identified the patient as a Churchill County dairy worker who had exposure to infected cows. It reported conjunctivitis, no hospitalization, and recovery in progress when the report was prepared. The CDC said on February 26 that the worker had recovered. Nevada’s health officer report and the CDC update do not specify the worker’s precise job task, duration of contact, or biological route of exposure. The confirmed information is exposure to infected dairy cows; a more specific account of how exposure occurred has not been established in those reports.
What did the virus sequencing show?
CDC sequencing identified the virus as avian influenza A(H5N1), clade 2.3.4.4b, genotype D1.1. The worker’s virus sequence was nearly identical to sequences from H5N1 viruses detected in Nevada dairy cows with which the worker had contact. Nevada’s report distinguished D1.1 from genotype B3.13, which had caused the established U.S. dairy-cow outbreaks and most human infections described at the time.
The Associated Press account published February 10, 2025 described this as the first time D1.1 infection had been traced to a cow. That is a description of what was known then, not a claim about all later detections.
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What D1.1 means—and does not mean
Genotype identifies a particular combination of genetic features in a virus; it does not, by itself, tell whether a virus spreads readily among people. CDC also noted a PB2 D701N mutation in the worker-virus sequence. The mutation had previously been associated with more efficient replication in mammalian cells, but CDC reported no other changes associated with mammalian adaptation in the sequence data. That laboratory finding is not evidence that sustained human-to-human transmission had developed.
Did the infection spread to other people?
Nevada reported testing 20 other farm workers, including people with and without symptoms. All samples tested at the Nevada Public Health Laboratory were negative. Nevada’s report found no evidence of person-to-person spread from the dairy worker, and CDC likewise said it had identified no onward spread from this case. These findings describe the investigation; they do not establish that transmission is impossible.
In its February 26, 2025 update, CDC said, “To date, person-to-person spread of H5 bird flu has not been identified.” That statement is time-bounded and should not be read as a guarantee about future transmission.
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- For milk for human consumption the level is 0.5 ppb. Levels up to 300 ppb are allowed in certain circumstances for nondairy animal feed. The European Union’s aflatoxin regulations for groundnuts, tree nuts, dried fruit, spices, and cereals include limits as low as 4 ppb total aflatoxins and 2 ppb for aflatoxin B1. Some EU member states have also separately established their own maximum limits on aflatoxins.
How did officials describe the risk?
In the same February 26, 2025 update, CDC assessed the immediate risk to the general public as low and said people with work-related or recreational exposure to infected animals were at greater risk. CDC’s current situation page, marked updated March 6, 2026, continues to describe current public-health risk as low and says it monitors people with animal exposures. These assessments are dated snapshots and may change as circumstances and surveillance information change.
For perspective on the date-specific counts, CDC reported on February 26, 2025, that 67 of 70 confirmed U.S. human infections had exposure to infected or presumed infected dairy cows or poultry; three cases had no determined exposure source. Separately, the CDC situation page reports 71 total U.S. A(H5) human cases since February 2024: seven detected through national flu surveillance and 64 through human monitoring. The latter is a cumulative figure on a page marked updated March 6, 2026, which notes that CDC streamlined updates on July 7, 2025. These figures have different reporting dates and contexts and should not be treated as a single, directly comparable count.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this case means for animal owners and the public
The Nevada case involved a dairy worker exposed to infected cows; it is not evidence that ordinary contact with pets or other animals caused this infection. The reports do not identify a particular task or route of exposure, so they cannot support a more specific account of how the worker became infected. The practical distinction in the public-health assessment is between the general public, whose assessed risk CDC described as low, and people exposed to infected animals, who were considered at greater risk in the February 2025 update.
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Nevada’s January 21, 2025 technical bulletin, issued before this case, instructed clinicians to consider exposure categories such as contact with sick or dead animals, raw milk or dairy products, contaminated materials, and prolonged exposure in confined spaces when assessing possible human H5N1 infection. It called for prompt coordination with local health authorities when infection was suspected. It is clinical and public-health guidance, not a description of the Nevada worker’s exposure. Read Nevada’s technical bulletin.
For a clinical conjunctival swab collection, CDC’s procedure lists an N95 respirator, eye protection, disposable gown, and disposable gloves. That is PPE guidance for collecting a specimen in a clinical setting, not a farm-work purchasing recommendation. CDC conjunctival-swab collection guidance.
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