- Efficacy of Haemophilus influenzae type b polysaccharide-diphtheria toxoid conjugate vaccine in infancy. Eskola, J., Peltola, H., Takala, A.K., Käyhty, H., Hakulinen, M., Karanko, V., Kela, E., Rekola, P., Rönnberg, P.R., Samuelson, J.S. N. Engl. J. Med. (1987)