V-Safe Data Released — COVID Vaccine Side Effects

V-safe data on COVID vaccine side effects from over 10 million participants was released only after ICAN's FOIA litigation forced the CDC's hand — here's what the smartphone-based monitoring system captured.

V-safe — a smartphone-based text messaging and survey tool launched by the CDC in December 2020 for monitoring Covid-19 vaccine safety. The CDC called it "the most intensive vaccine safety monitoring effort in U.S. History." According to Aaron Siri, V-safe was deliberately designed to collect data unlikely to detect serious safety signals — and when even its limited health impact data showed alarming results, the CDC tried to hide it from the public.

Explanation

The CDC launched V-safe simultaneously with the first Covid-19 vaccine in December 2020. Approximately 10 million users registered, 9 million of them between December 2020 and April 2021 — the period of maximum vaccine enthusiasm before mandates, meaning users were likely vaccine supporters and hence prone to underreporting (not overreporting) harms.

V-safe collected data in two ways:

1. Check-the-box symptom options: 10 pre-selected symptoms (nausea, fatigue, etc.) that the CDC characterizes as "normal signs the body is building protection"

2. Health impact data: Whether users sought medical care, missed school/work, or could not perform normal activities — collected weekly for the first 6 weeks, then at 3, 6, and 12 months

3. Free-text fields: Open-ended narrative entries with character limits

The 7.7% Finding

When ICAN's firm obtained the suppressed health impact data after over two years of legal demands and two federal lawsuits, the data showed:

Siri's conclusion: Even among a pool of vaccine enthusiasts likely to under-report, nearly 1 in 13 sought medical care. If this rate didn't trigger a safety signal, V-safe was not designed to find one.

The CDC published over 40 studies on Covid-19 vaccine safety using V-safe data — but reported only the first week of health impact data in all of them, hiding the longer-term results.

The Prespecified Adverse Events of Special Interest Problem

The V-Safe Protocol (published November 19, 2020) identified "Adverse Events of Special Interest" (prespecified medical conditions) that the CDC specifically recognized as potential vaccine harms before launch:

Nearly all of these adverse events were also identified in: a CDC presentation (October 22, 2020), a NEJM article (July 2020), a JAMA article (October 16, 2020), and another CDC presentation (October 30, 2020) — all before the first vaccine was administered.

Despite the CDC itself prespecifying these conditions as potential harms, none of them — nor their common symptoms (e.g., chest pain for myocarditis) — were included as check-the-box options in V-safe. They were relegated to free-text fields, where:

Structural Design Critique

The 10 check-the-box symptoms collected during the first week were explicitly described by the CDC as "normal signs the body is building protection." These were never safety data — they were efficacy-proxy data. Reporting them at high rates was interpreted as the vaccine "working," not as a concern.

The only genuine safety metric in V-safe — seeking medical care — showed alarming results (7.7%) and was hidden from the 40+ published studies. The CDC reported only week 1 of health impact data across all its published safety analyses.

When 7.7% of registrants — predominantly vaccine supporters — sought medical care an average of 2–3 times each without triggering a safety signal, the system's capacity to detect harm is called into serious question.

ICAN Litigation

ICAN filed two federal lawsuits against the CDC to obtain the full V-safe check-the-box and health impact data. The CDC resisted for over two years. The 7.7% figure and the 25% health impact figure were released only as a result of this litigation.

Significance

V-safe was announced as a historic safety monitoring achievement. Siri argues it was designed to:

1. Collect check-the-box data for symptoms the CDC already characterized as normal (making high rates "good news")

2. Exclude the specific adverse events the CDC had preidentified as concerns from any check-the-box options

3. Limit reporting of serious events to free-text fields where rates would be undercaptured

4. Report only the first week of genuine safety data (medical care) in all published studies

5. Suppress the full results until forced by litigation

See Also

VAERS, VSD (Vaccine Safety Datalink), Post-Licensure Safety Monitoring, CDC, ICAN

Frequently Asked Questions

Frequently Asked Questions

What did the V-safe data reveal about COVID vaccine side effects?
After ICAN's FOIA litigation forced the CDC to release V-safe data, it showed 7.7% of users (approximately 1 in 13 people) needed medical care after COVID-19 vaccination. An additional 25% missed school or work or couldn't perform normal activities. Each person seeking medical care sought it an average of 2-3 times, and approximately 75% of visits were urgent care, emergency room, or hospitalization. The CDC had published 40+ studies using V-safe data but reported only the first week of health impact results.
Why did the CDC hide the V-safe health impact data?
ICAN filed two federal lawsuits to obtain the full V-safe data, which the CDC resisted releasing for over two years. The CDC published 40+ studies on COVID vaccine safety using V-safe but reported only the first week of health impact data in all of them, hiding the longer-term results that showed 7.7% of users needed medical care. The 10 check-the-box symptoms collected were symptoms the CDC characterized as "normal signs the body is building protection" — not genuine safety data.
Were V-safe's prespecified adverse events actually tracked properly?
No. The V-safe Protocol identified serious adverse events of special interest before launch — including heart attack, myocarditis, Guillain-Barre syndrome, stroke, seizures, and death. Despite the CDC itself prespecifying these conditions as potential harms, none were included as check-the-box options in V-safe. They were relegated to free-text fields where fewer people enter information and data is harder to standardize.
How many people participated in V-safe and were they biased?
Approximately 10 million users registered for V-safe, with 9 million registering between December 2020 and April 2021 — before vaccine mandates, during peak vaccine enthusiasm. This means participants were predominantly vaccine supporters, making them more likely to underreport than overreport harms. Even among this favorably biased pool, nearly 1 in 13 sought medical care after vaccination.
What was V-safe designed to detect according to its critics?
Aaron Siri argues V-safe was designed to collect data unlikely to detect serious safety signals. The 10 check-the-box symptoms were described by CDC as "normal signs the body is building protection." The specific adverse events the CDC had preidentified as concerns were excluded from check-the-box options. The only genuine safety metric — seeking medical care — showed alarming results (7.7%) that were hidden from all 40+ published studies until litigation forced disclosure.

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