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Experiments were carried out to study the kinetics of local interferon production in the subcutaneous tissues of rats stimulated with Newcastle disease virus. Specifically, the interferon produced and released in the extracellular fluids was collected at various intervals of time in micropore chambers implanted into the subcutaneous tissue of rats. Interferon was detected at moderate titers 1 h after induction, and it was present at high titer at 2 h. The interferon levels remained remarkably high in the samples collected after 3, 5, and 24 h, and in some rats it was still detectable after 48 and 72 h. Since control experiments showed that it requires 2 to 3 h for interferon to penetrate the chambers, it may be concluded that high concentrations of interferon are present in the extracellular fluid within 1 h of induction. The evaluation of the kinetics of production and of the concentrations attained in the extracellular fluid suggests that in a solid tissue a cell infected by a potent interferon inducer may produce interferon early enough and in sufficient quantity to protect neighboring cells before the production of progeny virions.

Rapid activation of the interferon system in vivo