Question

1. how did the environmental health interventions in the early 20th century affect the rates of infectious disease in the united states?

death from infectious disease decreased, but the number of infections increased.
deaths from infectious disease decreased by more than 75%.
rates of infectious disease stayed constant until the development of antibiotics.
rates of some infectious diseases decreased, but others increased

Explanation:

In the early 20th century, environmental health interventions such as improved sanitation (e.g., better sewage disposal, clean water supply) had a significant impact. These interventions reduced the spread of many infectious diseases. For example, diseases like cholera (spread through contaminated water) saw a sharp decline. The overall death - toll from infectious diseases decreased by more than 75% due to these environmental health measures.

• Option 1: If the number of infections increased while death decreased, it would mean the interventions were not effective in preventing the spread (only in treatment - which was not the main focus of early 20th - century environmental health interventions).
• Option 3: Environmental health interventions (not antibiotics) were the first major factor in reducing infectious disease rates in the early 20th century.
• Option 4: Early 20th - century environmental health interventions had a mostly positive and widespread impact (not a mixed bag of some increasing and some decreasing rates for major infectious diseases).

Answer:

Deaths from infectious disease decreased by more than 75%.