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Did they perform regular PCR testing on staff? No, and so they didn't detect any asymptomatic carriers. By comparison, all NHS staff are doing biweekly lateral flow tests, and hundreds of staff are detected prior to symptoms this way. This means that fewer staff are off sick/isolating, and more staff are available to care for patients.

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It’s a study. A completely harmless, simple study that does not preclude anything else and shows positive results. What is your complaint? That it isn’t 100% definitive in all cases? That something else is better? That’s not the way progress is made.

Something that detects 10% of cases and is completely free (using a device people are wearing anyway) is valuable. You can be sure that some of these cases would have been missed by all the other tests, simply because not every one of these cases got any test at all.

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