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Vaccine facts


  • Mild to moderate, more common after second dose

  • Generally, more frequent and severe in those <55

  • Systemic adverse reactions usually occur in 1-2 days and usually last 24 hours

  • The most common:


  • injection site reactions (84.1%)

  • fatigue (62.9%)

  • headache (55.1%)  

  • muscle pain (38.3%)

  • chills (31.9%)

  • joint pain (23.6%)

  • fever (14.2%)

[Click on an image to enlarge]
[Click on an image to enlarge]


(Pfizer & Moderna)

  • Your body naturally uses mRNA to send instructions when building proteins.

  • mRNA technology is new in vaccine production but is already being used in cancer treatment.

  • It has been studied for more than ten years.

  • The COVID-19 mRNA vaccines give instructions to our cells to make a harmless piece that looks like the “spike protein” on the surface of the COVID-19 virus.

  • Our immune system sees these fake spike proteins and builds antibodies that recognize them. In the future our immune system will now recognize when the COVID -19 virus enters the body and can fight it.

Visit this link for more info on mRNA vaccines: Understanding and Explaining mRNA COVID-19 Vaccines | CDC


ABOUT adenovirus vector vaccines


  •  Unlike the Pfizer-BioNTech and Moderna vaccines, which store the instructions in single-stranded RNA, the Johnson & Johnson vaccine uses double-stranded DNA.

  • The gene for the coronavirus spike protein was added to another virus called Adenovirus 26. Adenoviruses are common viruses that typically cause colds or flu-like symptoms. The Johnson & Johnson team used a modified adenovirus that can enter cells but can’t replicate inside them or cause illness.

  • This type of vaccine has been studied for decades.

Visit this link for more detailed info on the J&J vaccine: How the Johnson & Johnson Covid-19 Vaccine Works - The New York Times (


  • headache

  • fatigue

  • body aches

  • pain at injection site

  • redness

  • swelling

  • Local Reactions:

  • Systemic reactions:


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