The accompanying figure shows the effects of different treatments of drinking water on the incidence of typhoid

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The accompanying figure shows the effects of different treatments of drinking water on the incidence of typhoid fever in Philadelphia, 1890-1935. If filtration of drinking water caused such a dramatic decrease in the disease incidence, was it necessary to introduce chlorination a few years later?
Why or why not?
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Microbiology A Human Perspective

ISBN: 978-0073375311

7th edition

Authors: Eugene Nester, Denise Anderson, Evans Roberts

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