Combination diphtheria-tetanus-@ component acellular pertussis-inactivated poliovirus-Haemophilus influenzae b conjugate-hepatitis B vaccine ( DTaP@-IPV-Hib-HepB ) administered either concurrently with @-valent pneumococcal conjugate vaccine ( PCV@ ) or @ month apart was generally safe and immunogenic at @ , @ and @ months of age .