Abstract
Summary
1. The virustatic effect of 5-nitro-2-furaldehyde 4 (diethylaminopropyl) semi-carbazone on meningopneumonitis virus in the allantoic sac is reversed by cysteine given as late as 96 hours after the drug and virus. Injection of 10 mg of cysteine reduces temporarily the amount of nitrofuran in the allantoic fluid. 2. Since the nitrofuran had no in vitro virucidal effect at the concentrations used, the observed virustatic effect and its reversal are probably intracellular. 3. Cysteine did not reverse the virustatic effect of chloramphenicol or aureomycin.
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