“…One of these could be that the incidence of B cells, producing Ab2/3-antibodies after immunization with a virus-specific Abl is very low, since Ab2/3-antibodies which mimick a viral epitope may also act as autoThis article is an update of a paper presented at the Symposium on Idiotype Networks and Immune Regulation II, cosponsored by The Southwest Foundation for Biomédical Research, The American Cancer Society ( (3,4). Regulatory forces within the immune system prevent the activation of auto-reactive B or T lymphocytes, and may therefore prevent an Ab2/3 response.…”