A low-grade avian influenza found at a Missouri Turkey farm has led to federal officials culling 39,000 turkeys at the facility. During a routine inspection last week, USDA says inspectors found samples of H5N1 in a healthy flock, and the birds were destroyed as a precaution. The Wall Street Journal reports the strain is far less infectious and deadly than the H5N2 virus found in the Midwest last year. Still, the scare was enough to convince Japan to ban poultry shipments from part of the Southwest Missouri County where the farm is located. Industry officials say the discovery is unlikely to affect domestic trade beyond the immediate area because the virus us less dangerous than the highly pathogenic strains. The last serious case of the more infectious virus was found in January at an Indiana turkey farm.