Among the 35 biological molecules overlapped between PA- and COVID-19-associated molecules retrieved from QKB, 20 were involved in immune regulation, and some of these molecules, such as EEF1A, IL1β, IFNB1, IL6, CCL2, CXCL8, CCL5, PTGS2, and FOS, were mapped to the paths from PA to the coronavirus pathogenesis pathway. The gene discussed is CCL2; the disease is COVID-19.