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In the Early 1900s, Cities Such as Philadelphia Reduced the Incidence

Question 21

Multiple Choice

In the early 1900s, cities such as Philadelphia reduced the incidence of typhoid fever by


A) requiring residents to boil drinking water.
B) isolating human carriers.
C) filtering municipal drinking water through sand- bed filters.
D) using tertiary water treatment systems.
E) mass vaccination of residents.

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