Indeed. My short response is that the improvements in COVID-19 test equipment over the past six weeks have been staggering - both molecular (you have the virus) and antibody (you had the virus). I am hopeful that by October 1st Hawaii might have sufficient confidence in their testing and tracking capability to reopen for tourism.4 tests/hour on each analyzer. (a positive comes back quicker) As long as the plane is near empty or they buy a boatload of analyzers it could be fast enough.
Long response. Abbott's molecular test is a isothermal nucleic acid amplification test instead of a RT-PCR test which yields faster though thus far less accurate results. That said, the turn around time for RT-PCR test results has dropped dramatically in the past six weeks. All molecular tests suffer from having 'windows' in which a person might be contagious yet show negative.
Antibody tests (also known as Titers or Serology tests) currently vary wildly in effectiveness. It takes about 14 days for the body to produce antibodies to SARS-CoV-2 (the COVID-19 coronavirus) - first IgM antibodies and then IgG antibodies which stay around for some long period of time (how long depends on a number of factors). You want an antibody test that uses the Elisa technique and tests for both IgM and IgG. Also ideally, one that expresses the result as a number along a range and and not a simple positive/negative result. And ideally, ideally you want to administer both molecular and antibody tests simultaneously to get the most accurate answer as to whether someone is communicable.
We have no idea as of yet how effective COVID-19 antibodies are in protecting a person from the disease, how long such protection if any lasts, or how communicability is affected if at all. Antibodies for other diseases have a wide range of effectiveness - those for measles essentially grant lifetime immunity, those for SARS last a couple of years, and those for the common flu are quite limited in duration. Also and as an aside, most people in the US already carry the antibodies for around four other coronaviruses.
Lastly, I mention October 1st because US airlines have been given billions of dollars to keep flying through September 30th. Airlines have already told their personnel to expect flight reductions of 40-80% after that date. Which might allow Hawaii to open to 'limited' tourism without requiring further intervention.
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