If you feel sick DO NOT test for COVID19 | The case against using rapid antigen tests | My debate
What this video covers
In this December 2023 video, Prasad makes the case against using rapid antigen tests for COVID-19 when feeling sick — arguing that testing offers little value for most people and can do more harm than good. The video is framed around a debate he participated in, and at nearly 20 minutes it is one of his longer explainers on the theme.
Prasad’s argument has several strands. First, he contends rapid antigen tests have limited sensitivity, so a negative result doesn’t reliably rule out infection. In the video he puts numbers on it from the most recent Cochrane review of point-of-care antigen testing: average sensitivity of 73% in symptomatic people and 54% in asymptomatic people — meaning that under a test-only-the-sick strategy, roughly 56 of 100 people with COVID would be missed, and even testing everyone constantly would still miss 42 of 100. Second, he argues that for healthy, low-risk people, a positive result doesn’t change clinical management — antivirals aren’t indicated, and the advice is the same regardless: rest and stay home if you’re sick. Third, he contends the main consequence of a positive test is institutional: exclusion from work or school and disruption, without commensurate benefit.
He adds a behavioral argument he calls a compensatory or “Peltzman” effect: testing can perversely increase spread when people use results as permission. He gives two examples — a student who showed up in his lab coughing behind a surgical mask, insisting she was fine to work because she was masked, and a colleague who admitted she tested so that a negative result would justify going to clinic masked. His position, he notes, aligns with Denmark — which closed public testing in April 2023 — and Norway, neither of which recommends testing for most symptomatic people; the U.S. CDC’s test-if-symptomatic guidance, he says, makes America a global outlier. And he argues the whole enterprise cannot dent transmission at planetary scale: with billions of people and roughly 100 billion person-to-person interactions a day, the billion-test global market touches one in 100,000 interactions — he likens trying to slow COVID spread with testing to pouring a glass of water on the lawn while a forest fire advances on your house.
The chronicle notes the counter-position from infectious-disease specialists: that testing informs decisions for high-risk individuals (who may benefit from antivirals like Paxlovid), protects vulnerable contacts, and helps people make informed choices about isolation. Prasad’s response, as presented in the video, is that those are narrow exceptions — and that for the typical healthy adult, symptom-based behavior (stay home when sick, regardless of the pathogen) is the rational approach. As with his other “do not test” content, critics argued the advice risked normalizing indifference to transmission; supporters framed it as honest cost-benefit thinking.
Key points
- Prasad argues rapid antigen tests have limited sensitivity, so negatives don’t reliably rule out infection.
- He cites the Cochrane review: average antigen-test sensitivity of 73% in symptomatic people and 54% in asymptomatic people — implying roughly 56 of 100 people with COVID are missed under a test-only-the-sick strategy.
- According to Prasad, his position aligns with Denmark (public testing closed April 2023) and Norway, which don’t recommend testing for most symptomatic people; he calls the U.S. CDC a global outlier.
- He argues testing can backfire behaviorally: he cites a coughing student who came to his lab behind a surgical mask and a colleague who tested so a negative would justify going to clinic masked.
- He likens trying to slow transmission through testing to pouring a glass of water on the lawn while a forest fire advances on your house.
- According to Prasad, a positive result doesn’t change management for healthy, low-risk people — the advice is to rest and stay home either way.
- He contends the main consequence of testing positive is institutional disruption (work/school exclusion) without commensurate benefit.
- Prasad recommends symptom-based behavior: stay home when sick, regardless of what pathogen is causing it.
- Infectious-disease specialists’ counter-position: testing matters for high-risk patients eligible for antivirals and for protecting vulnerable contacts.
- The video extends Prasad’s broader late-pandemic theme that COVID exceptionalism in testing and isolation policy was no longer justified.