Abstract
In a previous publication (Manire and Meyer, 1950), the toxicity for mice of 39 strains of viruses in the psittacosislymphogranuloma group was reported. Following the intravenous injection of yolk sac suspensions into groups of mice, two-phase death curves were plotted from the death rates of mice injected with the Louisiana, Illinois, meningopneumonitis and feline pneumonitis viruses, but definite two-phase curves for the remaining strains were not demonstrated.
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