Nice thought Douglas, but I think he's a bit busy dispensing carefully
worded wisdom on the telly and radio (:-). And attending the Shakespeare?
For event organisers who are concerned, the free lateral flow tests
(LFTs) seem to be very good at spotting those who might be infectious.
That is, those with a moderate viral load (Ct of 25 or lower in a PCR
test), which equates to a 70% chance of being cultured, and is probably
a good lower limit on contagiousness.
https://www.sciencemag.org/news/2020/09/one-number-could-help-reveal-how-infectious-covid-19-patient-should-test-results
Then, the EU have done good work on collating the sensitivity of LFTs
(most in common use are above 95%) using the Ct <= 25 threshold, and
specificity (most in common use are nearly 100%).
https://ec.europa.eu/health/sites/default/files/preparedness_response/docs/covid-19_rat_common-list_en.pdf
So, if correctly applied, on the day, LFTs could weed out 95% of the
individuals who might be infectious. which is a very valuable reduction
in the probability of spreading events. I assume that if you do not
perform the swabbing and transfer correctly, then the control (C) line
will not appear. Perhaps I should experiment.
We sometimes see much lower sensitivities quoted, which I assume are
including the incubation period when PCR shows the infection with Ct
above 25, but the individual is not contagious; and after the infectious
period has ended, when PCR can still detect the virus, but again, the
individual is not contagious.
So, I will continue to use lateral flow tests before I will be in
prolonged proximity with possibly vulnerable people in an enclosed
environment. E.g. in a building, car or public transport. This is even
though I have had the full vaccine regime, because its overall
effectiveness against contagion still seems to elude us. The CDC says
that the fully vaccinated are "less likely to have asymptomatic
infection or to transmit SARS-CoV-2 to others", which is not very
encouraging.
https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/fully-vaccinated-people.html
Of course, this only helps with the Shakespeare decision above if the
festival encourages the use of such tests prior to arrival, and refunds
fees if people have to cancel on the day. Since I don't see that on
their website, perhaps they consider themselves to be inherently covid-safe?
As Tim (and Clint before him) said, "do I feel lucky?"
Ah-choo!
Alan Jones