lol, 50%? We're still at ~85-90% on the most contagious variant out there.
https://www.npr.org/sections/coronavirus-live-updates/2021/06/30/1011684609/moderna-says-studies-show-its-vaccine-is-effective-against-the-delta-variant
https://www.forbes.com/sites/leahrosenbaum/2021/07/27/how-good-are-covid-19-vaccines-at-protecting-against-the-delta-variant/?sh=537ed2fb1a6f
https://www.jnj.com/positive-new-data-for-johnson-johnson-single-shot-covid-19-vaccine-on-activity-against-delta-variant-and-long-lasting-durability-of-response