By Nermeen Nabil Khear 
A dairy worker in Nevada has been infected with a strain of H5N1 bird flu—genotype D1.1—that has newly spilled over to cows, the Centers for Disease Control and Prevention has confirmed.
The worker experienced conjunctivitis (pink eye) as the only symptom and is recovering, according to a separate press release by the Central Nevada Health District Monday.
The bird flu strain H5N1 clade 2.3.4.4b, genotype D1.1 is the predominant strain currently circulating in wild birds in North America and was confirmed for the first time in cows in Nevada last week. According to the US Department of Agriculture, the new spillover was initially detected on January 31 via bulk milk testing. Until this point, the outbreak of H5N1 in dairy cows—which was declared in March 2024—was entirely caused by H5N1 clade 2.3.4.4b, genotype B3.13. The outbreak was thought to have been caused by a single spillover event from wild birds to cows in Texas in late 2023 or early 2024.
This articles is written by : Nermeen Nabil Khear Abdelmalak
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