Efficacy and Duration of Protection
The vaccine offers effective protection the first year after being given (with between 50% to 80% efficacy) and the second year (31% to 76%), but not after that.
Read more about this topic: Vi Capsular Polysaccharide Vaccine
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—John Milton (1608–1674)
“For books are not absolutely dead things, but do contain a potency of life in them to be as active as that soul was whose progeny they are; nay, they do preserve as in a vial the purest efficacy and extraction of that living intellect that bred them. I know they are as lively, and as vigorously productive, as those fabulous dragon’s teeth; and being sown up and down, may chance to spring up armed men.”
—John Milton (1608–1674)
“Higher than the question of our duration is the question of our deserving. Immortality will come to such as are fit for it, and he would be a great soul in future must be a great soul now.”
—Ralph Waldo Emerson (1803–1882)
“A man with convictions finds an answer for everything. Convictions are the best form of protection against the living truth.”
—Max Frisch (1911–1991)