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Professor Sedgwick, a biologist at MA Institute of Technology, investigates a typhoid outbreak in Springfield. Despite initial checks on water and sewage systems, the source remains unknown. Sedgwick, suspecting the milk supply, traces the epidemic to contaminated milk from a local farm. His discovery ends the outbreak and is celebrated as a significant public health milestone.

How was the typhoid epidemic traced back to contaminated milk?

What was the significance of Doctor Sedgwick's discovery in the field of public health?