Abstract: Immunologically active agents are described, including isolated Pneumocystis A 12 protein or polypeptides; immunogenic conjugates containing Pneumocystis A 12 protein or polypeptide of the present invention; antibodies recognizing the Pneumocystis A 12 protein or polypeptide or the immunogenic conjugates of the present invention; and nucleic acid molecules that encode the Pneumocystis A 12 protein or polypeptide of the present invention, as well as DNA constructs, expression vectors, and host cells that contain the nucleic acid molecules. Disclosed uses of the antibodies, immunogenic conjugates, and DNA constructs include inducing passive or active immunity to treat or prevent pathogen infections, particularly by a Pneumocystis organism, in a subject.

Abstract: Immunologically active agents are described, including isolated Pneumocystis A 12 protein or polypeptides; immunogenic conjugates containing Pneumocystis A 12 protein or polypeptide of the present invention; antibodies recognizing the Pneumocystis A 12 protein or polypeptide or the immunogenic conjugates of the present invention; and nucleic acid molecules that encode the Pneumocystis A 12 protein or polypeptide of the present invention, as well as DNA constructs, expression vectors, and host cells that contain the nucleic acid molecules. Disclosed uses of the antibodies, immunogenic conjugates, and DNA constructs include inducing passive or active immunity to treat or prevent pathogen infections, particularly by a Pneumocystis organism, in a subject.

Abstract: A number of immunologically active agents are described, including an isolated protein or polypeptide that includes the amino acid sequence of SEQ ID NO: 1, immunogenic conjugates containing either the protein or polypeptide, a full-length Pneumocystis kexin, or a full length Streptococcus pneumoniae pneumococcal surface protein A (PspA), antibodies recognizing the protein or polypeptide or the immunogenic conjugates (particularly the epitope of SEQ ID NO: 1), and nucleic acid molecules that encode the protein or polypeptide, as well as DNA constructs, expression vectors, and host cells that contain the nucleic acid molecules. Disclosed uses of the antibodies, immunogenic conjugates, and DNA constructs include inducing passive or active immunity to treat or prevent pathogen infections, particularly by a Pneumocystis organism, in a patient.

Abstract: A number of immunologically active agents are described, including an isolated protein or polypeptide that includes the amino acid sequence of SEQ ID NO: 1, immunogenic conjugates containing either the protein or polypeptide, a full-length Pneumocystis kexin, or a full length Streptococcus pneumoniae pneumococcal surface protein A (PspA), antibodies recognizing the protein or polypeptide or the immunogenic conjugates (particularly the epitope of SEQ ID NO: 1), and nucleic acid molecules that encode the protein or polypeptide, as well as DNA constructs, expression vectors, and host cells that contain the nucleic acid molecules. Disclosed uses of the antibodies, immunogenic conjugates, and DNA constructs include inducing passive or active immunity to treat or prevent pathogen infections, particularly by a Pneumocystis organism, in a patient.

Abstract: A vaccine against a microbial pathogen comprised of a live, immunogenic but prototrophic and avirulent mutant strain of the selected microbial pathogen in an amount effective to confer immunity. A method of obtaining a vaccine that induces a heightened cellular and humoral immune response to one of a variety of microbial pathogens in a warm blooded animal. A method for isolation of an avirulent strain of a selected pathogenic microorganism.