These are side effects of the Covid-19 vaccine, according to the CDC.

According to the Vaccine Safety Datalink (VSD), it was observed that the incidence of Guillain-Barré syndrome (GBS) in the first 21 days after administration of the J&J/Janssen covid-19 vaccine was 21 times higher compared to the J&J/Janssen covid-19 vaccine. introduction of mRNA vaccines against covid-19 from Pfizer-BioNTech or Moderna.

Regarding myocarditis and pericarditis after vaccine administration, effects are rare. Myocarditis is inflammation of the heart muscle, and pericarditis is inflammation of the outer layer covering the heart. Most patients who develop myocarditis or pericarditis after Covid-19 vaccination respond positively to drug treatment and rest.

Finally, very rarely, thrombosis with thrombocytopenia (TTC) occurs, which is quite serious, although the incidence after vaccination is four per million J&J/Janssen doses. Thrombocytopenia-thrombosis syndrome (TTS) causes blood clots to form in large blood vessels and reduces platelet counts. This discovery led ACIP to recommend the use of mRNA vaccines (Pfizer and Moderna) against Covid-19.