Second U.S. bird flu case confirmed in Texas after cattle contact

A Texas resident has become only the second person in the United States to contract bird flu, a virus that typically circulates among wild birds but has now jumped to dairy cattle and, in this case, to a human who handled them. The patient's sole symptom was eye inflammation—a redness of the conjunctiva, the membrane lining the eyelid—which emerged after direct contact with cattle suspected of carrying the infection. Testing was completed late in the previous week, and the CDC confirmed the diagnosis over the weekend. The person is now receiving oseltamivir, an antiviral medication used to treat influenza strains including H5N1.

What makes this case notable is precisely what it is not. The infection did not settle in the lungs. There is no pneumonia, no respiratory distress, no sign of the severe illness that can accompany bird flu in humans. Dr. Céline Gounder, a medical contributor for CBS News, emphasized this distinction on air: the virus remained localized to the eye, which substantially reduces the likelihood of transmission to another person. Bird flu can present across a wide spectrum of severity—from mild eye infection to pneumonia, acute respiratory distress, and death—but this patient landed at the gentler end of that range.

The timing of this case underscores a shift in how the virus is moving through animal populations. Just days before the Texas diagnosis, federal agencies announced that dairy cattle had become infected across multiple states: Texas, Kansas, and Michigan. This marks the first time that this particular strain of bird flu has established itself in U.S. dairy herds. The virus has been devastating wild bird populations globally, killing millions, and has also spread to marine mammals—sea lions, seals—and even a polar bear. Now it has reached livestock that humans work with daily.

Health officials have moved quickly to contain the risk, though they stress that the danger to the general public remains low. The Texas Department of State Health Services is providing guidance to affected dairies on how to minimize worker exposure and how to recognize symptoms that warrant testing. The virus has not mutated in ways that would make it more transmissible between people, according to initial analysis. Person-to-person spread of bird flu remains extraordinarily rare. The last confirmed U.S. case occurred in Colorado in 2022, when a person involved in slaughtering infected poultry developed fatigue and recovered after isolation and antiviral treatment.

The pathway to infection is well understood: the virus enters through the eyes, nose, or mouth, or is inhaled. People at highest risk are those with close, prolonged, unprotected contact with infected birds or cattle—those without respiratory or eye protection who touch the animals or their secretions. For workers in affected dairies, the guidance is straightforward: monitor for flu-like symptoms, which include fever, chills, cough, sore throat, fatigue, and difficulty breathing. The distinguishing feature, notably, is eye redness. Healthcare providers, including optometrists and ophthalmologists, have been alerted to watch for conjunctivitis in patients with recent animal exposure.

Beyond the occupational risk, officials have issued warnings about raw, unpasteurized milk from affected herds. Commercially available milk is pasteurized and safe; the concern is with unpasteurized products that may carry the virus. For the broader population, the recommendations are the ones that apply to any flu season: wash hands frequently, cover coughs and sneezes, avoid handling dead birds or animals, and stay home when sick.

The case in Texas represents a rare but real crossing of the species barrier. It is not a sign of imminent pandemic, nor does it suggest the virus has acquired new capacity to spread among humans. It is, rather, a reminder that as the virus circulates more widely in animal populations—wild birds, now cattle—the chances of human contact increase. The system appears to be working: a person became infected, symptoms were recognized, testing was conducted, treatment was provided, and public health agencies mobilized to prevent further spread. What happens next depends on whether the virus remains contained to isolated exposures or whether it finds new pathways into the human population.