I et prospektivt sammenlignende studie, som sammenholdt administration af kombineret DTPw- HBV med samtidig og separat administration af DTPw og HBV, fandtes højere incidens af smerte, rødme, hævelse og feber i den gruppe, der modtog den kombinerede vaccine.
5 In a prospective comparative study, which compared the administration of the combined DTPw-HBV vaccine with the simultaneous separate administration of DTPw and HBV vaccine, higher incidences of pain, redness, swelling and fever were reported in the group receiving the combined vaccine.