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Clinical trial
Clinical-trial and public-health reporting consistently list local pain at the injection site, fatigue, headache, muscle aches and chills as the most commonly reported side effects after Pfizer’s COVI...
The assembled evidence identifies as the most consistently observed rare long-term adverse events associated with the Pfizer-BioNTech BNT162b2 vaccine, particularly after mRNA dosing in younger age gr...
The body of evidence as of late 2025 does not establish a causal link between the Pfizer-BioNTech COVID-19 vaccine (BNT162b2) and increased cancer risk; surveillance and systematic reviews show common...
Isolated incidents occurred where people were injected with saline or diluent instead of a COVID-19 vaccine, typically because of preparation or handling errors at specific clinics or pharmacies. Ther...
The evidence assembled shows that the Johnson & Johnson (Ad26.COV2.S) vaccine and mRNA vaccines (Pfizer-BioNTech, Moderna) have broadly favorable safety profiles but have been observed in post‑licensu...
Available studies and regulatory summaries show myocarditis after COVID-19 vaccination is rare, concentrates in males aged ~12–24 and most often occurs within days of a second mRNA dose; FDA cites ~27...
Available reporting shows both 2024–25/2025 updated mRNA boosters (Pfizer, Moderna) and a protein‑subunit booster (Novavax/Nuvaxovid) were offered and monitored for safety; several studies and news an...
Original mRNA COVID-19 vaccines (Pfizer-BioNTech, Moderna) introduced in late 2020 used lipid nanoparticle-formulated mRNA and a short list of excipients; later updates from 2022–2024 shifted only the...
Recent peer‑reviewed and media reports describe a small Turkish study that found short‑term corneal changes after two doses of the Pfizer‑BioNTech COVID‑19 vaccine (BNT162b2), including slight corneal...
Clinical and surveillance reports list a spectrum of neurological symptoms after mRNA COVID-19 vaccines, most commonly transient and mild (headache, fatigue, numbness/paresthesia), with rare but serio...
The simple answer: ; U.S. vaccine product labels show , so official ingredient counts for authorized products range from six to seven . A 2024 preprint claiming dozens of undeclared chemical elements ...
No large-scale studies with more than five years of follow-up on the original Pfizer-BioNTech (Comirnaty/BNT162b2) or Moderna (Spikevax/mRNA-1273) mRNA COVID-19 vaccines are reported in the supplied s...
The evidence collected during and after large-scale COVID-19 vaccination campaigns shows different long-term safety signals for the adenovirus-vector Johnson & Johnson (J&J/Janssen) shot versus the mR...
Vaccine manufacturers Pfizer-BioNTech, Moderna and Novavax produced updated COVID-19 vaccine formulas for the 2023–2025 seasons; regulators authorized successive strain-updated monovalent versions (XB...
Clinical trial-era data and early post-rollout monitoring showed both Pfizer-BioNTech (Comirnaty) and Moderna (Spikevax) mRNA vaccines cause similar patterns of local and systemic side effects that ar...
Clinical and surveillance reporting through 2024–2025 shows the Pfizer–BioNTech (Comirnaty) COVID-19 vaccine routinely causes short-lived local reactions (arm pain) and systemic effects (fatigue, feve...
Multiple peer‑reviewed studies and investigative reports show that the SARS‑CoV‑2 spike protein (or fragments thereof) can be detected in human blood after Pfizer‑BioNTech (BNT162b2) vaccination for a...
Clinical-trial and systematic-review data identify as the most frequently reported short-term side effects after the Pfizer-BioNTech (BNT162b2) vaccine, with in pooled studies . Independent re-analyse...
Modern U.S. COVID-19 vaccines are complex products whose full ingredient lists are provided in official package inserts and CDC product information; the CDC’s interim clinical considerations explicitl...
Large safety-monitoring studies and regulatory agencies report a handful of rare but serious adverse events linked to Pfizer-BioNTech (Comirnaty) COVID-19 vaccines—most consistently myocarditis/perica...