Facebook Twitter Tumblr Close Skip to main content FactCheck.org® A Project of The Annenberg Public Policy Center ![\\"Become](\\" mini.png\\"/) ![\\"Follow](\\" twitter.png\\"/) ![\\"Get](\\" ![\\"Follow](\\" instagram-1.png\\"/) ![\\"Sign](\\" ![\\"Help](\\" SciCheck’s COVID-19/Vaccination Project Learn More FactCheck.org® * Home * Articles * Featured Posts * FactCheck Posts * SciCheck * En Español * 2024 elections * Players Guide 2024 * Debunking Viral Claims * Ask a Question * Ask FactCheck * Ask SciCheck * Donate * Topics * President Biden * Donald Trump * Kamala Harris * JD Vance * Tim Walz * health * Coronavirus * immigration * climate change * View All * About Us * Our Mission * Our Process * Our Funding * Our Staff * Undergraduate Fellows * Awards * Request a Correction * Contact Us * Search * More * Viral Claims * Subscribe * Instagram * Threads * YouTube * X (Twitter) * Facebook * TikTok * FactCheck On the Air * Mailbag FactCheck Posts › Featured Posts › SciCheck # Instagram Post Makes Invalid Comparison Between COVID-19 and Flu Vaccines By Jessica McDonald Posted on February 19, 2021 | Updated on May 19, 2021 This article is available in both English and Español English Español * * * * * ## SciCheck Digest A tweet shared on Instagram baselessly claims that a person is 300 to 900 times more likely to die “after getting the #Covid vaccine than the flu vaccine.” But the comparison is faulty — and there is no proof that people are dying from COVID-19 vaccines. ![\\"\\"](\\" vaccination-04%402x.png\\"/) How do we know vaccines are safe? How do we know vaccines are safe? * * * * * * * * * * No vaccine or medical product is 100% safe, but the safety of vaccines is ensured via rigorous testing in clinical trials prior to authorization or approval, followed by continued safety monitoring once the vaccine is rolled out to the public to detect potential rare side effects. In addition, the Food and Drug Administration inspects vaccine production facilities and reviews manufacturing protocols to make sure vaccine doses are of high-quality and free of contaminants. One key vaccine safety surveillance program is the Vaccine Adverse Event Reporting System, or VAERS, which is an early warning system run by the Centers for Disease Control and Prevention and FDA. As its website explains, VAERS “is not designed to detect if a vaccine caused an adverse event, but it can identify unusual or unexpected patterns of reporting that might indicate possible safety problems requiring a closer look.” Anyone can submit a report to VAERS for any health problem that occurs after an immunization. There is no screening or vetting of the report and no attempt to determine if the vaccine was responsible for the problem. The information is still valuable because it’s a way of being quickly alerted to a potential safety issue with a vaccine, which can then be followed-up by government scientists. Another monitoring system is the CDC’s Vaccine Safety Datalink, which uses electronic health data from nine health care organizations in the U.S. to identify adverse events related to vaccination in near real time. In the case of the COVID-19 vaccines, randomized controlled trials involving tens of thousands of people, which were reviewed by multiple groups of experts, revealed no serious safety issues and showed that the benefits outweigh the risks. The CDC and FDA vaccine safety monitoring systems, which were expanded for the COVID-19 vaccines and also include a new smartphone-based reporting tool called v-safe, have subsequently identified only a few, very rare adverse events. For more, see “How safe are the vaccines?” Link to this ![\\"\\"](\\" vaccination-06%402x.png\\"/) How effective are the COVID-19 vaccines? How effective are the COVID-19 vaccines? * * * * * * * * * * All of the authorized and approved vaccines are effective at preventing severe COVID-19. Against earlier forms of the coronavirus, the vaccines were highly effective at preventing symptomatic illness. For example, clinical trials for the Pfizer/BioNTech and Moderna mRNA vaccines and the protein-based Novavax vaccine found each reduced the risk of getting sick by more than 90%. Subsequent studies have demonstrated that the vaccines are effective under real-world conditions. Against omicron variants, however, the vaccines haven’t fared as well and are much worse at preventing infection or mild disease. The shots are still good at preventing hospitalization or death, though, particularly if someone stays up-to-date on vaccination. Starting in September 2023, the Food and Drug Administration approved or authorized updated 2023-2024 vaccines that target the latest prevalent omicron variants. The Centers for Disease Control and Prevention recommends these vaccines for everyone 6 months or older. For more on these shots, see our “Q&A on the Updated COVID-19 Vaccines.” Link to this ## Full Story A Feb. 15 tweet, subsequently shared on Instagram, cites unvetted information submitted to a federal database to baselessly claim that COVID-19 vaccines are significantly more dangerous than influenza vaccines. Experts, however, say that’s a misuse of the numbers — and the suggestion that COVID-19 vaccines are killing one in every 10,000 immunized people is groundless. “How much more likely are you to die after getting the #Covid vaccine than the flu vaccine?” the tweet, from novelist and former New York Times reporter Alex Berenson, begins. “300-900 times, based on federal VAERS reports. Yes, 900,” he answers, referring to the government’s Vaccine Adverse Event Reporting System, adding that for COVID-19 vaccines, it’s “1 death reported per 35,000 shots or 10,000 completed vaccinations (so far),” but for flu “1 death per 9,000,000 vaccinations.” “That’s a safe vaccine,” Berenson then says of the flu vaccine. “Those deaths are likely coincidental, a simple result of the number of shots given. The #Covid vax, not so much.” But Berenson’s analysis relies on the fallacy that any death that occurs after vaccination must be related to the vaccine. “VAERS does not determine death, period,” a spokesperson for the Centers for Disease Control and Prevention told us. “Just because somebody reports death doesn’t mean that the vaccine caused the death. So we don’t use VAERS to determine death rates or anything concerning death.” ![\\"\\"](\\" terms of the number of death reports following each vaccine at the time of his tweet, Berenson’s numbers check out. The CDC, for example, had written on its website that as of Feb. 7, 1,170 deaths had been reported to VAERS following the administration of 41 million doses of COVID-19 vaccines. That’s around one report per 35,000 doses. (The number listed on the website is now 934 death reports out of 52 million doses, through Feb. 14; a CDC spokesperson said the decline is because the agency switched to include only domestic reports to match the number of doses administered in the U.S.) But the comparison to flu is problematic, and the conclusion that COVID-19 vaccines are therefore unsafe is unfounded. Reports through VAERS do not necessarily mean that a vaccine caused the adverse event, as anyone can submit reports, regardless of whether an immunization is thought to have contributed. When deaths following receipt of a vaccine are reported, CDC and Food and Drug Administration physicians review those cases — and so far with the COVID-19 vaccines, there has been no link with immunization. A CDC spokesperson told us that to date, the agency has not received confirmation of a single COVID-19 vaccine-related death. Update, May 19: After investigating 15 cases of a rare clotting condition out of nearly 8 million Johnson & Johnson vaccinations, the CDC and Food and Drug Administration are warning of a suggested increased risk of the dangerous condition, which occurred in women and resulted in three deaths as of April 21. The CDC says “women younger than 50 years old especially should be aware of the rare risk of blood clots with low platelets after vaccination, and that other COVID-19 vaccines are available where this risk has not been seen.” As of May 11, 28 cases had been identified out of more than 9 million J&J vaccines administered. For more, see “Q&A on the Rare Clotting Events That Caused the J&J Pause.” Moreover, experts said it’s not surprising that more death reports would be submitted to VAERS after COVID-19 immunizations compared with flu, given the increased attention on the vaccine. “The difference in deaths reported following COVID-19 vaccine and flu vaccine administration is likely due to the enhanced reporting of all events occurring after COVID vaccination compared to after influenza vaccination,” Dr. Robert Legare Atmar, an infectious disease specialist at Baylor College of Medicine who also evaluates vaccines, told us. Berenson, who frequently appears on conservative media, has previously misinterpreted a study to suggest that face masks are ineffective against the novel coronavirus. His tweets have formed the basis of another misleading claim online, also citing VAERS data, about adverse reactions to COVID-19 vaccines relative to flu vaccines. ## Understanding VAERS To understand why Berenson’s scary-seeming statistics should not be alarming, it’s useful to know how VAERS works and the limitations of its data. As its website explains, VAERS is an early warning system that “is not designed to detect if a vaccine caused an adverse event, but it can identify unusual or unexpected patterns of reporting that might indicate possible safety problems requiring a closer look.” The system accepts any report of a reaction that occurs after an immunization. There is no screening or vetting of the report and submissions are accepted “without judging whether the event was caused by the vaccine.” A disclaimer users must read before accessing the public data therefore warns that reports “may include incomplete, inaccurate, coincidental and unverified information,” and notes that the utility of the data is limited because most reporting is voluntary. The information is still valuable because it’s a way of being quickly alerted to a potential safety problem with a vaccine, which government scientists can then investigate. In the case of COVID-19 vaccines, VAERS is just one of several vaccine safety monitoring systems the government has in place to ensure the safety of the vaccine as it’s rolled out to a wider population. But VAERS data isn’t meant to allow safety comparisons between vaccines or to arrive at any sort of estimate of a person’s chances of dying following an immunization. Indeed, the disclaimer specifically cautions against doing the kind of math Berenson performs. “The number of reports alone cannot be interpreted or used to reach conclusions about the existence, severity, frequency, or rates of problems associated with vaccines,” it reads. Instead, a CDC spokesperson said, when a serious adverse event such as death is reported, the agency collects information, including medical records, autopsy reports, death certificates — and a qualified physician determines the cause of death. “We look for patterns, we look for warning signals — but we do not use VAERS to determine death or death rates,” she said. “Those have to be verified.” ## Increased Reporting for COVID-19 Vaccines Given the way that VAERS works, there are several reasons why there would be more reports of death following a COVID-19 vaccine in the system than for influenza vaccines — none of which would have anything to do with the vaccine’s actual safety profile. “There’s a heightened awareness of this virus, and hence, heightened awareness of this vaccine,” said Dr. Paul A. Offit, a vaccine expert at the Children’s Hospital of Philadelphia and a member of the FDA’s Vaccines and Related Biological Products Advisory Committee reviewing COVID-19 vaccines. The COVID-19 vaccines, too, have initially “been geared toward an older population that is more likely to have medical problems,” he said. Because the vaccines protect against COVID-19 but were “not designed to prevent everything else that happens in life,” Offit said, it’s expected that some number of people — especially the elderly — will die, entirely coincidentally, after receiving a vaccine. (SciCheck has addressed this before in “Video Makes Bogus Claims About ‘War Crimes’ and COVID-19 Vaccine Safety.”) The CDC told us that reports of deaths occurring after COVID-19 immunization are under investigation, but that from the data thus far, “it appears many of these deaths are among nursing home residents who had serious underlying conditions and death was not hastened by the vaccination.” Atmar, of Baylor, who has made recommendations about influenza vaccines as part of the CDC’s Advisory Committee on Immunization Practices, also said that it’s a mistake to overinterpret the VAERS death reports. “Persons with underlying conditions and living in nursing homes/long-term care facilities die of their underlying conditions on a daily basis,” he said in an email. During flu season, those deaths are unlikely to be reported to VAERS because they are not thought to be related to the flu vaccine, he explained. But with COVID-19, whether or not a death is thought to be due to the vaccine or a person’s medical condition, the deaths are being reported to VAERS. “This ‘biased’ differential in reporting makes it appear that there is a difference in [the] death rate among recipients of the two types of vaccines,” he said. “Instead, what it represents is a difference in reporting.” Because COVID-19 vaccines are authorized under an emergency use authorization, there are in fact different reporting requirements to VAERS for the vaccines than for others. As is explained on the VAERS website, health care providers are required to report all deaths that occur after a COVID-19 vaccination, regardless of the suspected cause. With other vaccines, providers are encouraged to submit reports of death following vaccination, whether or not they believe the vaccine was the cause, but they are not required to do so unless the death occurs following a so- called reportable event for the vaccine, such as an allergic anaphylactic reaction. Editor’s note: SciCheck’s COVID-19/Vaccination Project is made possible by a grant from the Robert Wood Johnson Foundation. The foundation has no control over our editorial decisions, and the views expressed in our articles do not necessarily reflect the views of the foundation. The goal of the project is to increase exposure to accurate information about COVID-19 and vaccines, while decreasing the impact of misinformation. ## Sources “Selected Adverse Events Reported after COVID-19 Vaccination.” CDC. Accessed 18 Feb 2021 and archived version, last updated 11 Feb 2021. “VAERS Data.” VAERS website. Accessed 18 Feb 2021. CDC spokesperson. Phone interview with and email sent to FactCheck.org. 18 Feb 2021. Atmar, Robert Legare. Professor of medicine and infectious diseases, Baylor College of Medicine. Email sent to FactCheck.org. 17 Feb 2021. Greene, Jay. “Amazon reverses ban on book critical of coronavirus lockdown after decision is blasted by many, including Elon Musk.” Washington Post. 5 Jun 2020. “Danish face mask study did not show that masks were ineffective at reducing spread of COVID-19; study was underpowered and results were inconclusive.” Health Feedback. 20 Nov 2020. Kertscher, Tom. “A claim comparing adverse events for COVID-19, flu vaccines exaggerates raw data.” PolitiFact. 15 Jan 2021. “Frequently Asked Questions (FAQs).” VAERS. Accessed 18 Feb 2021. “Guide to Interpreting VAERS Data.” VAERS. Accessed 18 Feb 2021. “Vaccine Adverse Event Reporting System (VAERS).” CDC. Accessed 18 Feb 2021. “COVID-19 Vaccine Reporting Systems.” CDC. Accessed 18 Feb 2021. “COVID-19 Vaccine Safety Surveillance.” FDA. 9 Feb 2021. Offit, Paul A. Director of the Vaccine Education Center and an attending physician in the Division of Infectious Diseases, Children’s Hospital of Philadelphia. Phone interview with FactCheck.org. 17 Feb 2021. * Categories * FactCheck Posts * Featured Posts * SciCheck * Location * National * Issue * coronavirus * COVID-19 * COVID-19 vaccination * influenza vaccination * VAERS * People * Alex Berenson * Misconceptions * Safety * Vaccination Previous StoryFactChecking Biden’s Town Hall Next StoryPosts Mislead on Biden’s Response to Texas Emergency Ask SciCheck Q: Are wind farms harmful to the environment? A: Like all energy sources, wind farms have some negative environmental impacts. But getting energy from wind farms results in dramatically lower greenhouse gas emissions than getting it from fossil fuels. Read the full question and answer View the Ask SciCheck archives Have a question? Ask us. 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A person is 300 to 900 times more likely to die after getting the vaccine than the flu vaccine