Sent_en: 2zh The strain of the disease had already been identified as an O1 BFS67-like virus, which was isolated in a 1967 outbreak and was being used at the labs for research and the production of vaccines.
Sent_yy: 这种疾病的菌株已被鉴定为O1 BFS67样病毒，该病毒于1967年爆发时被分离出来，并在实验室用于研究和生产疫苗。