Abstract
Virus.?The J. P. strain of lymphocytic choriomeningitis virus was used.6 This strain was maintained by serial subcutaneous passages in guinea pigs, and its identity was verified periodically by neutralization tests with known choriomeningitis antiserum. The LD50 titer was 10~6 when inoculated intracerebrally into Swiss mice or subcutaneously into guinea pigs weighing 300 to 400 g. Rhesus monkeys {Macaca mulatto) uniformly succumbed to subcutaneous inoculation (0.5 cc) with lO-4 dilutions of this strain. Further details of the properties of this strain are described elsewhere.5
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