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The Johnson & Johnson (Janssen) COVID‑19 vaccine has been linked to very rare, serious adverse events—primarily vaccine‑induced thrombosis with thrombocytopenia (VITT/TTS) and rare reports of Guillain...
Known long-term or delayed serious adverse events tied to the Johnson & Johnson (Janssen) COVID‑19 vaccine are rare and limited mainly to two clotting and neurologic syndromes — thrombosis with thromb...
Public, consumer-facing lot‑number lookup tools exist for some COVID‑19 vaccines (for example Moderna’s Vial Lookup and manufacturer/Janssen checkers), but Pfizer (Comirnaty/BNT162b2) does not maintai...
Large surveillance studies and safety summaries show different rare long‑term risks for the Janssen (J&J) adenovirus vaccine versus mRNA vaccines: J&J has been associated with rare thrombosis with thr...
Pfizer and Moderna mRNA vaccines produce (injection-site pain, fatigue, headache, fever) that are generally mild and resolve in days, with likely due to a higher mRNA dose . Rare serious events differ...
Clinical surveillance through 2022–2025 finds , with Janssen linked more to thrombosis with thrombocytopenia syndrome (TTS) and Guillain-Barré syndrome (GBS), and mRNA vaccines showing higher signals ...
The Johnson & Johnson (Janssen) COVID-19 vaccine has been linked to a very small number of rare but serious adverse events—most notably vaccine‑induced thrombotic thrombocytopenia (TTS, also called VI...
Available reporting links Johnson & Johnson’s (J&J/Janssen) adenovirus‑vector COVID‑19 vaccine to a rare syndrome—thrombosis with thrombocytopenia syndrome (TTS)—with roughly 57–60 reported U.S. cases...
mRNA COVID-19 vaccines can trigger short-lived changes in immune markers and—in rare cases—cause inflammatory conditions such as myocarditis; major public-health reviews and cohort studies find no sus...
Regulatory agencies and multiple studies since 2021 have linked a very small number of neurological and immune-mediated conditions to the Janssen/Johnson & Johnson (J&J) adenoviral‑vector COVID‑19 vac...
Available reporting and official guidance do not describe the Janssen (Johnson & Johnson) COVID-19 vaccine as a substance the body “expels” on a defined timetable; rather, it is an intramuscular viral...
Since 2020, illicit fentanyl production has shifted through three measurable trends: clandestine chemistry diversified from older Janssen/Siegfried routes toward “one‑pot” and Gupta‑style methods that...
Routine blood tests can show transient immune activation after mRNA COVID-19 vaccination — most commonly temporary rises in inflammatory markers and antibody levels as part of the intended immune resp...
Regulatory agencies and medical literature link the Johnson & Johnson/Janssen COVID-19 vaccine to a small but measurable increase in a few specific autoimmune-type disorders, most notably Guillain-Bar...
Reports and peer-reviewed reviews link several rare, long-term neurological syndromes to COVID-19 vaccination in general — most commonly Guillain-Barré syndrome (GBS), functional neurological disorder...
Regulatory reviews and surveillance from 2021 onward identified a small number of rare but serious adverse events after the Janssen (Johnson & Johnson) COVID-19 vaccine — chiefly thrombosis with throm...
The preponderance of reports from 2021–2025 shows that the . Large passive-safety datasets and narrative reviews agree that serious neurological adverse events are uncommon relative to vaccine doses a...
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...
Available reporting and peer‑reviewed reviews show rare neurological events have been reported after COVID‑19 vaccination overall and some specific associations were identified with the Johnson & John...