During the 1870s, doctors suspected this contaminated substance to be responsible for many infant deaths.

Name: During the 1870s, doctors suspected this contaminated substance to be responsible for many infant deaths.
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During the 1870s, doctors suspected contaminated milk to be responsible for many infant deaths, as milk was a primary source of nutrition for infants and could easily become contaminated with bacteria if not properly handled or stored.

During the 1870s, Doctors Suspected This Contaminated Substance to Be