An egg farm in the southeastern port city of Pohang is closed in this photo taken on Sunday, as officials started culling chickens. — courtesy Yonhap SEOUL — South Korea"s agricultural authorities said Friday they are investigating yet another suspected case of highly pathogenic bird flu amid growing concerns over a prolonged battle against the animal disease, Yonhap reported. The latest suspected case of the H5N8 strain of avian influenza linked to farms was reported in Chungju, 147 kilometers south of Seoul, according to the Ministry of Agriculture, Food and Rural Affairs. The egg farm is raising 550,000 chickens. South Korea said it has imposed a travel ban within a 10-kilometer radius of the suspected farm. The test result is expected to be delivered within three days. On the previous day, South Korea confirmed two additional cases, raising the total caseload of farm-linked infections to 105. The total number of highly pathogenic bird flu cases from wild birds, meanwhile, stayed at 224 as of Friday. — SPA/Yonhap