Patents Assigned to Elmer R. Pfefferkorn
  • Method for the immunization of animals and men against Toxoplasma gondii _
    Patent number: 4473549
    Abstract: A method for the immunization of mammals (including man) and birds, against Toxoplasma gondii is described which involves subcutaneous administration of a live, low-virulent vaccine comprising a temperature-sensitive mutant of the persistent, virulent RH strain of T. gondii. The vaccine gives immunity against subsequent challenge, but does not persist and does not cause chronic infection of the subject and which therefore cannot result in illness or death in the event that the subject later becomes immunosuppressed.
    Type: Grant
    Filed: July 30, 1982
    Date of Patent: September 25, 1984
    Assignees: The Kansas University Endowment Association, Elmer R. Pfefferkorn
    Inventors: Jacob K. Frenkel, Elmer R. Pfefferkorn