Analysis indicated that their PCT, CRP and LDH levels were positively correlated with infection (PCT, r = 0.717, P = 0.000; CRP, r = 0.628, P = 0.000; LDH, r = 0.239, P = 0.003), with PCT and CRP having a relatively high and LDH a relatively low correlation. Here, CALCA is linked to infection.