A second booster of Pfizer’s COVID-19 vaccine was linked to a lower mortality rate in people aged 60 or older, according to a new study from Israel. Researchers examined data from a medical records system run by Clalit Health Services and found that the death rate among the elderly who received two boosters, or four total shots, was 0.03 percent. The death rate among elderly who had gotten only a single booster shot was 0.1 percent. “This study demonstrates a substantial reduction in COVID-19 mortality by the second-booster in eligible subjects,” the researchers, primarily employed by Clalit, wrote in the study. The paper was published as a preprint ahead of peer review. The study analyzed the fate of 563,465 Clalit members aged 60 to 100 who were eligible for a second booster. Approximately 58 percent received a fourth shot. Pfizer’s primary regimen of two shots has proven insufficient to protect against COVID-19, …