In the summer people get encephalitis ("sleeping sickness") and poliomyelitis ("infantile paralysis"). In the winter people get sore throats, running noses, influenza. The fact that there are no pandemics of colds in the summer or infantile paralysis in the winter set Dr. Charles Armstrong, virus expert of the U. S. Public Health Service, to thinking. It set him thinking even harder when mice, inoculated with sleeping sickness virus, died just as often at temperatures of 42° F. as they did at temperatures of 95° F. Since sleeping sickness and infantile paralysis both...
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