protection ratio
Britishnoun
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012Example Sentences
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In nonparalytic polio, the protection ratio was only about 3 to 2, but final returns were expected to show that the disease had been milder, on the average, in vaccinated children.
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