Read the text below and answer the question:
"Wastewater-based epidemiology has emerged as a cost-effective sentinel tool for public health surveillance. Because infected individuals shed viral pathogens in stool days before manifesting clinical symptoms, quantitative PCR testing of municipal sewage provides early warning of community outbreaks before clinical hospitalizations surge."
Why is wastewater surveillance an effective early warning system for viral outbreaks?
Answer and explanation
Correct answer: B. it detects viral shedding in sewage days prior to clinical symptoms
- Step 1: Locate the mechanism in the text: 'Because infected individuals shed viral pathogens in stool days before manifesting clinical symptoms, quantitative PCR testing of municipal sewage provides early warning'.
- Step 2: It gives advance notice by capturing asymptomatic and pre-symptomatic viral shedding in the sewer system.
Answer
it detects viral shedding in sewage days prior to clinical symptoms.
Why not the others: 'it purifies all municipal sewage water into sterile drinking water' confuses epidemiological surveillance with wastewater treatment; 'it eliminates the requirement for diagnostic testing in hospitals' is false as individual clinical diagnoses remain necessary; 'it prevents infected individuals from spreading respiratory pathogens' confuses detection with infection control.
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