There are currently 21 COVID-19 vaccines authorized for use across the globe. Worldwide, over 13% of the population has been fully vaccinated against COVID-19, according to the data compiled by Google.
Millions of vaccinated people have experienced side effects, including swelling, redness, and pain at the injection site. Fever, headache, tiredness, muscle pain, chills, and nausea are also commonly reported Trusted Source.
As is the case with any vaccine, however, not everyone will react in the same way. Many people have not reported or experienced side effects after their vaccination. Does this mean that they are not protected against SARS-CoV-2?
Data from the trials of the two-dose mRNA COVID-19 vaccines — Pfizer-BioNTech and Moderna — indicate that these are over 90%Trusted Source effective. Under 10% of those fully vaccinated may have partial to no protection.
Because of the way in which vaccines work — by prompting the body to build up immunity against the target pathogen — individuals with compromised immune systems may not be able to build up complete or even partial immunity to SARS-CoV-2.