CHICAGO—The U.S. Department of Agriculture on Wednesday reported an outbreak of highly pathogenic avian flu in an Indiana turkey flock, the nation’s first case in a commercial poultry operation since 2020. Cases of the disease, known as bird flu, can hurt the U.S. farm sector because poultry are killed and trading partners can limit imports from infected areas. China said on Monday it banned imports of poultry from Spain and Moldova due to outbreaks. Bird flu does not present an immediate public health concern, the USDA said. About 29,000 turkeys at the farm in Dubois County, Indiana, in the south of the state, are being culled to contain the outbreak, which was confirmed after 100 birds recently died, state officials said. Indiana said the strain of the virus was H5N1 and that it was the state’s first case of highly pathogenic bird flu in commercial poultry since 2016, when 400,000 …