Anaphylaxis is treatable if recognized early and treated promptly. However, this reaction after the first dose is not a contraindication for the administration of the second dose.Ĭases of anaphylaxis to the mRNA COVID-19 vaccines are very rare - currently estimated to occur in 2.5 to 11.1 cases per 1 million doses, largely in individuals with a history of allergy. They usually resolve in about 5 days, but in some cases they can persist up to 21 days. This reaction may appear earlier after administration of the second dose.
#SIDE EFFECT OF MODERNA VACCINE SKIN#
Myocarditis and pericarditis are mild in most cases and resolve with treatment and rest.ĭelayed skin reactions near the injection site have also been described, which occur about 7 days (between 2 and 12 days) after receiving the vaccine and have been described as oedematous, pruritic, and painful plaques. These cases occurred mainly in the 14 days following vaccination, with greater frequency after the second dose of vaccination, and more commonly in younger men. In addition, very rare cases of myocarditis and pericarditis (inflammation of the heart muscle or membrane around the heart) have been observed.
These reactions are more common after the second dose and their frequency decreases with age.
These reactions are mostly mild or moderate and transient, disappearing a few days after vaccination. The most common side effects are pain at the injection site (92%), fatigue (70%), headache (64.7%), myalgias (muscle pain) (61.5%), arthralgias (joint stiffness) (46.4%), chills (45.4%), nausea/vomiting (23%), fever (15.5%) and swelling at the injection site (14.7%).
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