The third dose will likely do very little for further boosting the vaccine's ability to reduce hospitalizations and deaths. That's because the vaccine is already pretty darn good at that.

Scott Hensley

Scott Hensley is an engineer at the Jet Propulsion Laboratory in Pasadena, California. He was named a Fellow of the Institute of Electrical and Electronics Engineers (IEEE) in 2014 for his contributions to radar remote sensing of the Earth and planetary bodies, and advancements in interferometric synthetic-aperture radar.

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