| http://www.w3.org/ns/prov#value | - If mortality [from pertussis] continues to decline at the same rate during the next fifteen years [as in the last fifteen], it will be extremely difficult to show statistically that [pertussis vaccination] had any effect in reducing mortality from whooping cough. [note 2] Much the same is true not only of diphtheria and tetanus. but of TB, cholera, typhoid, and other common scourges of a bygone er
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