COVID-19 Update: Reintroducing to Society and the New Normality (Pt. 2)

21 Apr 2020 · 14 min
14:29

Aaron Hartman, MD (YouTube, Apr 21, 2020) reviews COVID-19 goals of lockdown (flattening the curve and protecting hospitals), argues that lockdowns broaden but do not change the eventual number infected (he cites a 70–80% herd-immunity threshold), and questions whether current testing is accurate enough to drive policy. He contrasts PCR sensitivity by timing/specimen (high early, declines after day 6–14; bronchoalveolar lavage highest) and gives antibody-test performance (87% sensitive, 93% specific). He summarises several seroprevalence reports (NYC obstetric patients ~13.7% positive with 87% asymptomatic; Dutch blood donors ~3%; Stanford/Santa Clara 2.5–4%; Iceland ~50% asymptomatic) and discusses resulting lower case-fatality estimates (examples he gives: NYC ~1.4%, Holland ~0.66%, Santa Clara 0.06–0.1%). He advocates for locally tailored reopening decisions, focused protection of high-risk people, consideration of herd immunity strategies, use of mitigation technologies (UVC, HEPA, masks), and public debate to guide policy.

Questions this video answers

70–80% of the population.

Over 90% sensitive on days 1–3.

Less than 80% sensitive by day 6; less than 50% after day 14.

Bronchoalveolar lavage ~95% sensitive; sputum ~72%; mouth (oral) swabs ~32%.

About 87% sensitive and 93% specific.

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