Why hasn't the epidemic situation in Lanzhou been cleared?

The risk of social communication has not been eliminated. Lanzhou, referred to as "Lan" or "Gao", was called Jincheng in ancient times. It is the capital of Gansu Province, the center of politics, culture, economy, science and education, and an important central city in the western region. Because the risk of social transmission has not been eliminated, the epidemic situation is not clear. Epidemic situation, Chinese vocabulary, refers to the occurrence and development of epidemic diseases. Severe acute respiratory syndrome (SARS) is an epidemic in China.