Peter McCullough on health: what the evidence says · JRE #1747

What the evidence says 01 / RECORD

The 39% figure traces to a real finding in a 2021 Lancet Infectious Diseases study (Singanayagam et al.) of UK household contacts during the Delta wave: of 31 SARS-CoV-2 infections that occurred in fully vaccinated household contacts, 12 (39%) arose from an epidemiologically linked index case who was also fully vaccinated. This is a proportion within a small subgroup of breakthrough infections in already-vaccinated people, not a measure of overall transmission or of vaccine failure to reduce spread. The same study found the secondary attack rate among household contacts exposed to the Delta variant was lower for fully vaccinated contacts (25%) than unvaccinated contacts (38%), and that fully vaccinated people who did become infected cleared the virus faster, though their peak viral load was similar to unvaccinated cases, allowing onward transmission including to other vaccinated people. The finding is specific to the Delta variant era (2020-2021 cohort) and does not generalize to claims that vaccines provide no protection against transmission; it instead shows vaccination reduced but did not eliminate transmission risk, with breakthrough transmission occurring more than initially expected with Delta. McCullough's quote is not fabricated but omits this context, presenting a subgroup statistic as if it demonstrated vaccines have no effect on spread.