Abstract
Summary
Suspensions of Polioviruses Types I, II and III in medium 199 derived from infected monkey kidney cell cultures were not completely inactivated following exposure for 1 hour to temperatures of 60° and 65°C. In one instance infectious virus was demonstrated in a suspension of Poliovirus Type II after heating at 75°C for 1 hour. Progeny of virus surviving at this temperature exhibited increased thermoresistance.
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