- Type B hepatitis: the infectivity of blood positive for e antigen and DNA polymerase after accidental needlestick exposure. Alter, H.J., Seeff, L.B., Kaplan, P.M., McAuliffe, V.J., Wright, E.C., Gerin, J.L., Purcell, R.H., Holland, P.V., Zimmerman, H.J. N. Engl. J. Med. (1976)