 Our study found that patients with long COVID-19 had significantly different gut microbiome profiles compared to those without gastrointestinal symptoms. Furthermore, we identified a correlation between certain gut microorganisms and potentially harmful metabolites in the blood. This suggests that the gut microbiome may play a role in the development of long COVID-19 symptoms. This article was authored by Diu Zhong, Xiyu and Wing, Chuan Chaoxia, and others.