ADDITIONAL booster shots may be necessary not only if the protective effects of Covid-19 vaccines wane but also if new coronavirus variants become increasingly resistant to present vaccines, says Dr Leow Chiuan Yee, a senior lecturer specialising in vaccinology and immunology at Universiti Sains Malay-sia’s School of Pharmaceutical Sciences.
At this moment, the Malaysian National Pharmaceutical Regula-tory Agency (NPRA) has only approved the same brand of vaccine to be used for primer (first and second) jabs, says Dr Leow. However, he believes it is possible to mix vaccines in the future if clinical studies show encouraging results.
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