Agricultural officials in the US state have confirmed that cattle in Nevada have conducted a positive test for the stress of H5N1 bird flu that had never been seen in cows before. Infected cows are showing respiratory symptoms such as cough and sneezing.

According to experts, detection indicates that different forms of virus known as Type A H5N1 have spread to cattle at least twice from wild birds. It is now raising new questions about broad proliferation and difficulty of controlling animal infections and people working together.

New H5N1 stress known as D1.1

The new bird flu is also called D1.1 by scientists. Louisiana is associated with a deadly human case After coming in contact with sick birds last year. D1.1 Tension has emerged to dominate infections in wild birds and hen herds in North America in recent months.

Symptoms seen in humans infected with D1.1 are more severe than the previous bird flu strain that are spreading in cows. That stress called B3.13 has produced only light symptoms like pink eye and fever in infected humans after exposure to sick cows.

Studies say that B3.13 is less likely to cause serious illness For humans, unlike other bird flu strains abroad. However, the risk is different for other animals, such as pet cats, which have recently died after exposed to contaminated food and milk with B3.13.

The discovery of the spread of the D11 bird flu strain to the cows also increases the previous principles floating by the US health and agricultural authorities that the spillover of the virus in the cows from the wild birds was a rare, one-closed event. All cases of bird flu in cows were first linked to B3.13 since a spillover in Texas in late 2023, which the authorities have quoted as evidence of the fact that new variants of the virus are repeatedly quoted. Birds were not spreading in cows.

So far, at least 67 people in the US have been infected with bird flu, mostly those who work closely with dairy or cattle, according to US Centers for Disease Control and “Detection does not change the USDA’s HPAI elimination strategy , “Animal and plant health inspection service of the US Department of Agriculture, also states that the federal government has tried to prevent unprecedented growth of highly pathogenic avian influenza or HPAI in recent years.

In addition to the human health threats generated by the virus, the toll claimed by a spillover of D11 in chickens from wild birds has also increased egg prices across the country.

D1.1 The number of workers coming in contact with stress is not clear

According to officials, so far, it is not clear how many workers in the state can be brought into contact with D1.1 stress after working with sick cows. The Center for Disease Control and Prevention says that 40 out of 67 since 2024 have confirmed human bird flu cases, with viruses coming into contact with sick dairy cows. Most other have been the result of exposure to infected poultry.

The CDC says that the risk for humans is low, and it is working with the state and county health officials to protect human health and safety.

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