"when would a longer quarantine be needed to prevent the spread of an infectious disease? "

The isolation and therapy of suggestive individuals, joined with the detaining of individuals that have a great chance of having been tainted, establish two commonly used pandemic control measures. Although retirement is apparently always a acceptable public fitness measure, quarantine is more debatable. Mass quarantine can inflict important social, psychological, and economic values without appearing in the exposure of many infected individuals.

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