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The prophylactic potency of topically applied human leukocyte interferon and human fibroblast interferon was compared in a monkey model with herpes simplex virus type 1-induced keratitis. Both interferons effectively prevented keratitis at 1.9 X 10(6) U of activity per ml but were ineffective at 1.9 X 10(3) U/ml. Slight differences between human leukocyte interferon and human fibroblast interferon observed at the level of 1.9 X 10(5) U/ml were not statistically significant.
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Neumann‐Haefelin et al. (1977) studied this question.
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