![]() ![]() ![]() These changes can cause the emergence of new “variants” of the original virus and may have different properties than the original virus, such as increased transmissibility or the ability to cause more severe disease. All viruses evolve over time through genetic variations.A large body of evidence suggests that vaccines are safe and effective against COVID-19.Number of adverse events following immunization (AEFI) by vaccine name reported in Alberta Note: The age group 5-11 year olds includes those who received the Pfizer-BioNTech Comirnaty pediatric COVID-19 vaccine and those who were eligible to receive the Pfizer-BioNTech Comirnaty COVID-19 vaccine because they were 11 but would turn 12 in 2021. Note 2: The age group 5-11 year olds includes those who received the Pfizer-BioNTech Comirnaty pediatric COVID-19 vaccine and those who were eligible to receive the Pfizer-BioNTech Comirnaty COVID-19 vaccine because they were 11 but would turn 12 in 2021. Note 1: individuals who received a first dose in one age category may cross into another age category for a second or third dose. ![]()
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