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This has nothing to do with the variants. They've changed the testing policy for the vaccinated, so more of the vaccinated are getting tested. The efficacy wa

This has nothing to do with the variants. They've changed the testing policy for the vaccinated, so more of the vaccinated are getting tested. The efficacy was artificially high before because the vaccinated were rarely tested and therefore rarely reported as infected.

chopin 5y ago
Do you have sources for this?
- damontal 5y ago
  anecdotal but my son has had cough and fever for the last week. we took him to the urgent care at the hospital and because he's vaccinated they didn't even bother with a covid test.
- oldgradstudent 5y ago
  Started around April. For example (random Google search): https://www.google.co.il/amp/s/www.makorrishon.co.il/news/338713/amp/ https://www.google.co.il/amp/s/www.makorrishon.co.il/news/33... Vaccinated passengers coming from countries with the Delta variant asked to get tested again 72 hours after arrival. Since then fully vaccinated were asked to get tested on multiple occasions during contact tracing when encountering the Delta variant. To quote Prof. Ran Balicer (co-author of the 95% efficacy NEJM paper): https://www.haaretz.co.il/health/corona/.premium-1.9971759 https://www.haaretz.co.il/health/corona/.premium-1.9971759 > It is very difficult to estimate vaccine efficacy because coronavirus testing is done selectively.
- oldgradstudent 5y ago
  A more official source from the Israeli ministry of health: > Notably, Israel’s SARS-CoV-2 testing policy was different for unvaccinated and vaccinated individuals during the study period. At 7 days after the second dose, vaccinated individuals were exempt from the SARS-CoV-2 testing required of individuals who either had contact with a laboratory-confirmed case or returned from travel abroad. This testing policy might have resulted in a differential bias that would cause over- estimation of vaccine effectiveness against asymp- tomatic infection (ie, asymptomatic people who received two doses were less likely to be tested than unvaccinated asymptomatic people). https://doi.org/10.1016/S0140-6736(21)00947-8 https://doi.org/10.1016/S0140-6736(21)00947-8

chopin 5y ago

Do you have sources for this?

damontal 5y ago
anecdotal but my son has had cough and fever for the last week. we took him to the urgent care at the hospital and because he's vaccinated they didn't even bother with a covid test.
oldgradstudent 5y ago
Started around April. For example (random Google search): https://www.google.co.il/amp/s/www.makorrishon.co.il/news/338713/amp/ https://www.google.co.il/amp/s/www.makorrishon.co.il/news/33... Vaccinated passengers coming from countries with the Delta variant asked to get tested again 72 hours after arrival. Since then fully vaccinated were asked to get tested on multiple occasions during contact tracing when encountering the Delta variant. To quote Prof. Ran Balicer (co-author of the 95% efficacy NEJM paper): https://www.haaretz.co.il/health/corona/.premium-1.9971759 https://www.haaretz.co.il/health/corona/.premium-1.9971759 > It is very difficult to estimate vaccine efficacy because coronavirus testing is done selectively.
oldgradstudent 5y ago
A more official source from the Israeli ministry of health: > Notably, Israel’s SARS-CoV-2 testing policy was different for unvaccinated and vaccinated individuals during the study period. At 7 days after the second dose, vaccinated individuals were exempt from the SARS-CoV-2 testing required of individuals who either had contact with a laboratory-confirmed case or returned from travel abroad. This testing policy might have resulted in a differential bias that would cause over- estimation of vaccine effectiveness against asymp- tomatic infection (ie, asymptomatic people who received two doses were less likely to be tested than unvaccinated asymptomatic people). https://doi.org/10.1016/S0140-6736(21)00947-8 https://doi.org/10.1016/S0140-6736(21)00947-8