If you take the time to read the last part of the very large thread which I linked to Greg, you will discover MY views on testing and contact tracing, I was saying four years ago what the health authorities are only starting to think about now....I cannot speak for others regarding "quarantine", but it did work very successfully in Cuba when the long term effects of the condition were unknown.
For quarantine to have a beneficial effect, it has to be implemented early in any epidemic.....things have now reached a critical stage.