was later verified principally by others. One may note his theories of the relationship of viruses to cancer as an example: Viruses may cause cancer by making cells unresponsive to normal control mechanisms, or possibly, by transducing abnormal genes from one cell to another or, perhaps, the so-called cancer viruses may actually be abnormal genetic material derived from the first host. The pref...

Objective: Hypericum perforatum (St. John's Wort) has long been used in traditional medicine to treat a variety of internal and external ailments. The present study was done to evaluate the immumodulatory potentials of the hydroalcoholic extract of H. perforatum. Materials and Methods: Twenty male BALB/c-mice were randomly allocated in two equal groups and immunized with sheep red blood cells (...

Considerable advances have been made recently in our understanding of the pathogenesis and the immunological mechanisms involved in the prevention and control of infection by Bordetella pertussis. Traditionally , research on protection has focused on the role of humoral immunity and several reports have shown that passive transfer of antibodies against several putative protective antigens, incl...

The Abstract was presented at the Fourth Herpes Virus Meeting, Cold Spring Harbor, N. Y. Dr. Pollard's present address is Division of Infectious Diseases, University of Texas Medical Branch, Galveston, Texas. Received for publicatiotn 2 October 1979 anid inl revised forimi 14 December 1979. recovery of phytohemagglutinin transformation often preceded recovery of the responses to viral antigens....

When sensitive lymphocytes are cultured with the appropriate antigen, lymphoblasts appear after 24-48 hr of incubation and the number of these increases steadily from the 2nd to the 6th or 7th day. Our problem was to discover, at a cellular level, how this increase takes place; whether it is a massive response of many cells, stepwise recruitment of cells into the lymphoblast class, or simply re...

Tetraspanins are a superfamily of integral membrane proteins involved in the organization of microdomains that consist of both cell membrane proteins and cytoplasmic signalling molecules. These microdomains are important in regulating molecular recognition at the cell surface and subsequent signal transduction processes central to the generation of an efficient immune response. Tetraspanins, bo...

Background: Tonsils and adenoids are involved in both local immunity and immune surveillance for the development of immune defense mechanisms. A number of investigators have found decreased immunoglobulin levels after adenotonsillectomy while others have failed to find significant changes. The effects of adenotonsillectomy on the cellular immunity of children have not been investigated extensiv...