Mean serum retinol concentration was 0.80 ± 0.35 μmol/L with 46% (88 children out of 193) <0.7 μmol/L (the cut-off for VAD) [11], although the utility of this measurement is limited as markers of chronic or acute inflammation (e.g., α1-acid glycoprotein and C-reactive protein) were not taken to correct for the impact of infection in these children, which is known to lower serum retinol independent of VA status [11]. Here, CRP is linked to infection.