COVID-19 Pandemic Global Health Public Health Research

Third dose of COVID-19 shot?

COVID-19 vaccines are working to protect against death along with some protection against hospitalization and mild infections. The latter protections seem to be declining in effectiveness plus Delta variant (and Lamba variant) are some of the reasons why US announce approval of a third shot (dose) for US population at 8 months or later after receiving the first two doses of Pfizer/BioNTech SE & Moderna.