You could experience soreness at the injection site, fatigue, headache, body aches, and fever. These symptoms don't last long — about 1 to 3 days.
How long does the COVID vaccine last? Studies suggest COVID vaccines are most effective in the first few months following your shot. That's why when health experts recommend boosters or updated doses, they're usually given three to four months after your last COVID shot.
Long post-COVID vaccination syndrome (LPCVS) is an increasingly recognized disease that occurs after SARS-CoV-2 vaccinations and lasts >4 weeks. However, little is known about the clinical presentation, underlying pathophysiology, treatment, and outcome of LPCVS.
In some people, COVID-19 vaccines can lead to heart complications called myocarditis and pericarditis. Myocarditis is the swelling, also called inflammation, of the heart muscle. Pericarditis is the swelling, also called inflammation, of the lining outside the heart.
People are considered fully vaccinated for COVID-19: two weeks or more after they have received the second dose in a 2-dose series (Pfizer-BioNTech or Moderna or other vaccine authorized by the World Health Organization), or two weeks or more after they have received a single-dose vaccine (Johnson and Johnson J&J/ ...
The updated mRNA COVID-19 vaccines include Comirnaty and Spikevax, both of which are approved for individuals 12 years of age and older, and the Moderna COVID-19 Vaccine and Pfizer-BioNTech COVID-19 Vaccine, both of which are authorized for emergency use for individuals 6 months through 11 years of age.
After vaccination, nearby cells pick up these proteins. Next, our immune system recognizes that these proteins do not belong there. Another ingredient in the vaccine, the adjuvant, helps our immune system to produce antibodies and activate other immune cells to fight off what it thinks is an infection.
To date, the systems in place to monitor the safety of COVID-19 vaccines currently used in the United States have identified anaphylaxis and myocarditis or pericarditis as serious types of adverse events following COVID-19 vaccination.