• At which point their role becomes tenuous.

    In isolation yes.

    But LFDs need to be considered within the scope of limited (and decreasing) PCR test capacity:-

    https://twitter.com/chrischirp/status/1411753644404453380

    "
    Test return times are getting longer in England (test and trace report & comparing specimen to report dates).

    A lot of testing capacity was closed in the spring in the expectation cases would never get that high again. They will (as govt admits!) - what's the plan? No testing?
    "

    If we had proper PCR capacity to provide swift turnarounds (overnight ideally) then we wouldn't need to rely on LFDs to botch a countrywide testing strategy.

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