Coronavirus: Singapore

Side effects of vaccine indicate immune systems are reacting

Doctors say it does not mean vaccine is less effective if people do not have side effects

Staff of Sree Narayana Mission at the observation area after receiving their Pfizer jabs in January. Results of clinical trials for both the Pfizer and Moderna vaccines show that younger adults tend to report more frequent and severe side effects tha
Staff of Sree Narayana Mission at the observation area after receiving their Pfizer jabs in January. Results of clinical trials for both the Pfizer and Moderna vaccines show that younger adults tend to report more frequent and severe side effects than older people. ST PHOTO: KEVIN LIM
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When healthcare student Melanie Hui, 21, got her first dose of the Pfizer vaccine in February, her arm was so sore she could not lift it to tie her hair.

Ms Hui, who is also a cross country runner, said she also felt fatigued and had headaches for about two days after the jab.

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A version of this article appeared in the print edition of The Sunday Times on April 18, 2021, with the headline Side effects of vaccine indicate immune systems are reacting. Subscribe