A friend said that Yan Limeng was not an expert at all. She was only in her 30s this year. She was only an assistant in the laboratory. Her job was to use small hamsters to conduct experiments to analyze pathological reactions and infectivity. She usually had no chance to get in touch with core experiments and data. Although Yan Limeng's laboratory published related papers in the journal Nature during the new crown epidemic, she was only one of the co-authors, and the main content of the paper was to describe the symptoms of hamsters infected with the COVID-19, and human infections. Comparing the symptoms that appear is not related to the development of vaccines and antiviral drugs. Guo Wengui and Bannon said that Yan Limeng was a vaccine research expert who fled to the United States. In fact, she was just a little girl who gave injections to small hamsters and conducted surveillance records.