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Influenza A Detected in U.S. Cattle Herds

Mar 27, 2025
By Farms.com

Comprehensive Study Finds Flu Antibodies in Cattle

The University of Missouri has revealed new insights into the prevalence of influenza A in U.S. cattle, following a comprehensive study that tested blood samples from dairy and beef cattle across 15 states.

This study confirms that cattle are not only susceptible to typical bovine flu strains but also to human and swine influenza viruses.

Researchers tested 1,724 blood samples using enzyme-linked immunosorbent assay techniques, discovering that approximately 34% contained influenza A antibodies, with a significant presence of antibodies from the 2009 H1N1 and H3N2 strains, among others. Surprisingly, no evidence of H5N1 avian influenza was found in these cattle.

The findings come on the heels of multiple H5N1 detections in other mammals reported by the USDA, highlighting an ongoing concern regarding the virus's reach and the potential for new, more virulent strains emerging from animal reservoirs.

The research, extending over several states with the majority of samples from Missouri, signifies the critical need for continuous surveillance and study of influenza A in cattle.

This is to understand the dynamics of virus transmission across species and to mitigate future outbreaks affecting both agriculture and public health sectors.

As part of their ongoing efforts, the university plans to continue monitoring and studying these patterns, which is essential for developing strategies to manage and prevent interspecies virus transmission effectively.


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Wheat Yields in USA and China Threatened by Heat Waves Breaking Enzymes

Video: Wheat Yields in USA and China Threatened by Heat Waves Breaking Enzymes

A new peer reviewed study looks at the generally unrecognized risk of heat waves surpassing the threshold for enzyme damage in wheat.

Most studies that look at crop failure in the main food growing regions (breadbaskets of the planet) look at temperatures and droughts in the historical records to assess present day risk. Since the climate system has changed, these historical based risk analysis studies underestimate the present-day risks.

What this new research study does is generate an ensemble of plausible scenarios for the present climate in terms of temperatures and precipitation, and looks at how many of these plausible scenarios exceed the enzyme-breaking temperature of 32.8 C for wheat, and exceed the high stress yield reducing temperature of 27.8 C for wheat. Also, the study considers the possibility of a compounded failure with heat waves in both regions simultaneously, this greatly reducing global wheat supply and causing severe shortages.

Results show that the likelihood (risk) of wheat crop failure with a one-in-hundred likelihood in 1981 has in today’s climate become increased by 16x in the USA winter wheat crop (to one-in-six) and by 6x in northeast China (to one-in-sixteen).

The risks determined in this new paper are much greater than that obtained in previous work that determines risk by analyzing historical climate patterns.

Clearly, since the climate system is rapidly changing, we cannot assume stationarity and calculate risk probabilities like we did traditionally before.

We are essentially on a new planet, with a new climate regime, and have to understand that everything is different now.