F2 and diphtheria: Concerning the co-administered vaccine antigens for which the results were interpretable (diphtheria, tetanus, pertussis [PT, FHA, and PRN], HBs and Haemophilus influenzae type b polyribosylribitol phosphate [PRP]), antibody GMCs seemed to be reduced in the IPARA and DPARA groups and in the NPARA-IPARA group for some antigens; nevertheless, seroprotection/seropositivity rates remained high (≥95.5%) (Table 3, Table S5).