What are the most commonly reported non-serious side effects of the vaccine?

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The vast majority of reported side effects for Pfizer's Comirnaty vaccine in Malaysia have been non-serious.

As of December 26, 2022, Malaysia had administered over 44.8 million doses of Pfizer's Comirnaty Covid-19 vaccine. Out of the 20,131 reported side effects, 94.2 per cent were classified as non-serious. These commonly reported non-serious adverse events included fever, pain at the injection site, headache, muscle ache, and fatigue.
Non-Serious Side Effects Constitute the Overwhelming Majority of Reports

Of the 20,131 adverse effects following immunisation (AEFI) reports concerning the Comirnaty vaccine, a substantial 94.2 per cent were identified as non-serious. This indicates that these reported side effects were temporary and did not pose a significant risk to the health of vaccinated individuals. The total number of AEFI reports translates to approximately 449 reports per million doses administered, or 0.045 per cent of all doses given.
Common Non-Serious Reactions

The non-serious side effects most frequently observed and reported following Comirnaty vaccination in Malaysia encompassed a range of common, transient reactions. These included experiencing a fever, localized pain at the injection site, headaches, general muscle aches, and feelings of fatigue. These symptoms are generally consistent with expected immune responses to vaccination.
Serious Side Effects Represent a Small Fraction

The remaining 5.8 per cent of the 20,131 AEFI reports, amounting to 1,162 cases, were classified as serious. According to the World Health Organisation's classification, serious AEFI are those that lead to hospital admission, necessitate an extended hospital stay, have the potential to jeopardise health, cause significant loss of capacity, require intervention to prevent permanent damage, result in disability, or are suspected of causing death. Investigations into these serious reports are conducted by the Covid-19 Vaccine Pharmacovigilance Special Committee.

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What are the most commonly reported non-serious side effects of the vaccine?

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