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

What the evidence says 01 / RECORD

McCullough claimed natural SARS-CoV-2 infection confers permanent, lifetime immunity and that SARS-CoV-1 infection produced immunity that lasts "forever." The best available longitudinal evidence contradicts both parts of this claim. A national retrospective cohort study in Qatar tracking reinfection through mid-2022 found that protection from a prior SARS-CoV-2 infection peaked around 90% at 7 months but waned to roughly 70% by 16 months, with extrapolated models projecting under 10% effectiveness against reinfection by around 32 months; protection against Omicron reinfection specifically was already down to about 38% and falling further with time since the primary infection. A separate CDC case-control study in Kentucky found unvaccinated previously infected residents had 2.34 times higher odds of reinfection than vaccinated previously infected residents, indicating natural immunity alone was not fully protective. For SARS-CoV-1, a 2007 longitudinal study of 176 convalescent patients in China, published in the CDC's Emerging Infectious Diseases journal, found antibodies were maintained for an average of only about 2 years, with a significant drop in IgG-positive percentage and titers by the third year, leading the authors to conclude patients could become susceptible to reinfection more than 3 years after initial exposure. No systematic review or database search identified 135 studies establishing permanent immunity for either virus. Current evidence indicates immunity from both natural SARS-CoV-2 and SARS-CoV-1 infection wanes measurably over time rather than lasting a lifetime, making the claim false.