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Why Is The Current Bird Flu So Deadly?

What’s making the latest strain of bird flu so deadly? Avian influenza used to mostly affect poultry, and while it continues to decimate poultry populations around the world, the latest strain, H5N1, is spreading widely among wild birds. It also seems to be spreading to mammals more frequently.

“Something is quite different about this virus this go around,” Rebecca Poulson, a wildlife disease researcher at the University of Georgia, told Nature.

Researchers aren’t sure why the current outbreak hasn’t disappeared, but they believe mutations may have increased its ability to replicate or to infect a broader range of species.

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Episode 115: Home on the Range

Video: Episode 115: Home on the Range

We look at how high crop prices, driven in part by rising global food demand, biofuel incentives, and risk perspective and management, are encouraging the conversion of marginal grasslands into cultivated cropland. As more hay and pastureland is turned over to crop production, wildlife habitat becomes increasingly fragmented, leaving isolated “islands” of grass that may be too small to sustain functioning grassland ecosystems. We explore research using Alberta as a case study to understand the impact that conversion of hay and pasturelands into cropland could have on ecosystem intactness and biodiversity.