HBG2 and infection: Methemoglobin levels measured on day 7 post-infection did not differ between the two groups (normalized median (IQR); for ART + air  = 1.00 (0.76–1.19) and for ART + iNO  = 1.01 (0.95–1.17), p = 0.43 by Mann Whitney test, n = 11 per group).