Fauci’s personal diaries fuel renewed scrutiny of COVID-19 vaccine safety

Fresh scrutiny has emerged over the COVID-19 pandemic response after newly released personal diary entries of former U.S. health official Dr. Anthony Fauci revealed details of a serious lung condition he suffered in 2021, days before he is scheduled to testify before Congress.

The documents, released by U.S. Senator Rand Paul (R-Kentucky), cover Fauci’s personal notes from December 2019 through his retirement in late 2022. Lawmakers are expected to reference the records during Wednesday’s congressional hearing as they continue investigating the federal government’s handling of the COVID-19 pandemic.

One of the most closely examined entries is dated June 19, 2021, when Fauci described what he called a “horrible roller coaster day” after seeking medical attention for chest pain.

According to the diary, imaging scans initially raised fears of lung cancer before specialists concluded that the confirmed diagnosis was a pulmonary infarction — damage to lung tissue caused by an interruption in blood flow.

Fauci wrote that doctors advised immediate anticoagulant treatment with Eliquis, a prescription blood thinner, while recommending a follow-up CT scan three months later.

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Claims Linking Illness to Vaccination Draw Mixed Reactions

Although the diary does not identify the cause of the pulmonary infarction, its release has fueled renewed debate among some physicians and commentators over whether the condition could have been connected to Fauci’s earlier Moderna COVID-19 vaccination.

Cardiologist Dr. Peter McCullough argued that the medical episode may have resulted from a pulmonary embolism, which he described as a known but uncommon adverse event associated with mRNA COVID-19 vaccines. He further criticized federal health authorities for allegedly failing to adequately communicate potential vaccine risks to the public.

However, the diary itself contains no evidence linking Fauci’s illness to vaccination, and no physician cited in the released records attributed the pulmonary infarction to the Moderna vaccine.

Molecular biologist Richard Ebright of Rutgers University also expressed caution, saying he considered such a connection unlikely but not impossible.

Health Authorities Maintain Vaccines’ Benefits Outweigh Risks

U.S. health agencies, including the Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration (FDA), have acknowledged that COVID-19 vaccines were associated with rare adverse events but have consistently maintained that the benefits of vaccination outweigh the risks for the vast majority of people during the pandemic.

Researchers have also reported that COVID-19 infection itself significantly increases the risk of developing blood clots compared with vaccination.

Kennedy Renews Criticism of Fauci

U.S. Health Secretary Robert F. Kennedy Jr. reacted to the diary release by accusing Fauci of misleading the public on several aspects of the pandemic response, including mask guidance, social distancing, virus transmission and natural immunity.

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Speaking in a recent television interview, Kennedy argued that the government’s pandemic messaging damaged public trust and contributed to growing skepticism toward federal health institutions.

Research Shows Rare Cardiac Events Following Vaccination

Scientific studies have documented rare cases of heart-related complications following COVID-19 vaccination while generally concluding that no definitive causal relationship has been established for most reported cardiovascular events.

A 2021 pooled analysis involving patients in Singapore and previously published studies found that myocarditis occurred predominantly in younger males, usually within days of receiving an mRNA vaccine, while heart attacks were more commonly reported among older adults shortly after vaccination.

Singapore’s Ministry of Health later confirmed the country’s first fatality associated with the Moderna vaccine after a 28-year-old man died from myocarditis in 2023.

Separately, a 2022 systematic review examining reports of heart attacks following COVID-19 vaccination concluded that although cases had been documented across several vaccine platforms, existing evidence did not establish a definitive causal relationship.

Researchers at Stanford Medicine also reported in late 2025 that they had identified a possible immune mechanism involved in the rare myocarditis cases observed after mRNA vaccination.

The study estimated that vaccine-associated myocarditis remained uncommon, occurring in roughly one in 140,000 people after a first dose and one in 32,000 after a second dose, with the highest incidence among younger males.

Public Trust Remains Divided

The diary release comes amid continuing public debate over confidence in health institutions.

According to a recent KFF survey, 51 percent of Americans said they trust both the CDC and FDA to provide reliable health information, while confidence in political leaders continues to decline.

The survey also found that personal physicians remain the most trusted source of medical information, with 86 percent of respondents expressing confidence in advice from their own healthcare providers.

Fauci Yet to Respond

Fauci has not publicly commented on the release of the diaries despite multiple media requests.

The former director of the National Institute of Allergy and Infectious Diseases has consistently defended his management of the pandemic, maintaining that his recommendations reflected the best scientific evidence available at the time, even as public health guidance evolved.

Lawmakers are expected to question Fauci extensively during Wednesday’s hearing as congressional investigations into the U.S. pandemic response, vaccine policies and early COVID-19 decision-making continues.