Bruddah IZ
DA
In Israel, vaccinated individuals had 27 times higher risk of symptomatic COVID infection compared to those with natural immunity from prior COVID disease [95%CI:13-57, adjusted for time of vaccine/disease]. No COVID deaths in either group.
Comparing SARS-CoV-2 natural immunity to vaccine-induced immunity: reinfections versus breakthrough infections
This study demonstrated that natural immunity confers longer lasting and stronger protection against infection, symptomatic disease and hospitalization caused by the Delta variant of SARS-CoV-2, compared to the BNT162b2 two-dose vaccine-induced immunity. Individuals who were both previously infected with SARS-CoV-2 and given a single dose of the vaccine gained additional protection against the Delta variant.
Martin Kulldorff
@MartinKulldorff
Professor Harvard Medical School. Disease surveillance methods. Infectious disease outbreaks. Vaccine safety. Free SaTScan, TreeScan and RSequential software.
Comparing SARS-CoV-2 natural immunity to vaccine-induced immunity: reinfections versus breakthrough infections
This study demonstrated that natural immunity confers longer lasting and stronger protection against infection, symptomatic disease and hospitalization caused by the Delta variant of SARS-CoV-2, compared to the BNT162b2 two-dose vaccine-induced immunity. Individuals who were both previously infected with SARS-CoV-2 and given a single dose of the vaccine gained additional protection against the Delta variant.
Martin Kulldorff
@MartinKulldorff
Professor Harvard Medical School. Disease surveillance methods. Infectious disease outbreaks. Vaccine safety. Free SaTScan, TreeScan and RSequential software.