sentences:  Between 1917 and the early 1950s several therapies were explored in an effort to prevent deformities including hydrotherapy and electrotherapy.In 1935 Claus Jungeblut reported that vitamin C treatment inactivates the polio virus in vitro, making it non-infectious when injected into monkeys.In 1937, Jungeblut injected polio into the brains of monkeys, and found that many more monkeys that also received vitamin C escaped paralysis than controls - the results seemed to indicate that low doses were more effective than high doses.