Infanrix Penta er også blevet undersøgt i ni undersøgelser af boostervaccination med deltagelse af over 4 000 børn, hvoraf 714 fik Infanrix Penta som booster.
Infanrix Penta has also been studied in nine studies of booster vaccination involving over 4,000 infants, 714 of whom received Infanrix Penta as a booster.