Thirty-six cases of interstitial pneumonia in acquired immunodeficient states were treated with transfer factor (Dialysable Leukocyte Extract) and studied retrospectively. The criteria of efficacity of this treatment were: rapidity of immediate improvement, improvement after failure of other immunostimulant therapy and demonstration of a dose-related effect. The mechanism of the therapeutic action is unclear. There is no evidence in favour of "transfer" of cell mediated immunity. A non-specific mode of action (adjuvant effect, interferon synergy, proinflammatory action) seems much more likely.
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