Dr. Patricia Fox, national epidemiology officer for avian health at the United States Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS), said this week that it is still unclear why the current outbreak of highly pathogenic avian influenza (HPAI) is worse than the 2014/15 outbreak. What is clear is that U.S. biosecurity efforts are working as this outbreak has had less farm-to-farm spread, she said.
Reasons for severity, longevity of HPAI strain remain unclear

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