CD40LG and mastitis: IgG and IgM levels in cows with subclinical mastitis (10.26 ± 1.31 to 10.86 ± 1.82 g/L) were significantly higher than in control groups (2.63 ± 0.21 g/L to 2.74 ± 0.63 g/L) (p < 0.05).