The ALB, PLT and ALT levels of the HEV/respiratory tract infected patients were lower than in those of HEV patients without respiratory tract infection [31.63 ± 6.62 vs. 35.83 ± 8.47, p<0.001; 140.37 ± 80.15 vs. 176.73 ± 75.41, p<0.001; 166.00(54.50,570.50) vs. 433.00(105.00,1048.00), p<0.001, respectively]. Here, ALB is linked to Respiratory tract infection.