THE ANTIBODY RESPONSE IN MAN TO A QUADRIVALENT INFLUENZA VIRUS VACCINE
The antibody response to the subcutaneous inoculation of a single 1 ml. dose of a quadrivalent formalin-killed influenza virus egg vaccine has been measured. The vaccine used contained two A prime components and an A and a B component. Satisfactory responses were obtained two weeks after inoculation to the A and B components and to one of the A prime strains (FM1). A poor antibody response was noted to the other A prime strain incorporated in the vaccine (FW50). The highest levels were obtained with the Lee strain (Type B) which also stimulated an antibody rise to a recently isolated Type B strain. Antibody levels were maintained for at least 12 weeks. Treatment of the sera with RDE was found to influence the results obtained with the FM1 strain used.