Serious adverse events after COVID-19 vaccination in children aged six months to 11 years are rare, said HSA. The Moderna vaccine was rolled out on Oct 25 last year as a primary vaccine for children aged six months to four years, while the Pfizer-BioNTech jab was also made available as a booster for children aged five years to 11 years.Īs of Dec 31, 2022, more than 16,000 doses of the Moderna vaccine have been administered to children aged six months to four years, and more than 81,000 Pfizer-BioNTech booster jabs have been given to children aged five years to 11 years. There were 173 serious adverse event reports (0.004 per cent) for the first booster jab and 17 such reports (0.001 per cent) for the second booster shot. The reporting rates of adverse and serious adverse events for the mRNA vaccines remained rare, at 0.11 per cent (17,741 reports) and 0.007 per cent (1,119 reports) respectively. Including the monovalent mRNA vaccines, more than 10.5 million primary doses, 4.6 million first booster doses and 1.2 million second booster shots have been administered in Singapore as of Dec 31, 2022. This is the first HSA safety update to include data on the bivalent shots. HSA's latest update covers the period from the roll-out of the vaccines on Dec 30, 2020, to Dec 31, 2022. ![]() The serious adverse events reporting rates for the two bivalent vaccines are similar, at 0.001 per cent. These include serious allergic reactions, anaphylaxis, myocarditis, hypotension with tachycardia – fast heartbeat – and hearing loss, said HSA.Īn adverse event is classified as serious when it resulted in hospitalisation, a significant reduction in functioning level, a life-threatening illness or death. There were also six serious adverse events reported for the Moderna bivalent vaccine and two such events for the Pfizer-BioNTech bivalent vaccine. The non-serious adverse events include allergic reactions such as a rash, eyelid swelling, fever, giddiness, chest discomfort or an increase in blood pressure. The adverse events reported for the bivalent mRNA vaccines were similar to those that took the monovalent vaccine. This means the HSA saw an adverse event reporting rate of 0.012 per cent for the Moderna bivalent vaccine and a smaller 0.005 per cent for the Pfizer-BioNTech bivalent vaccine. More than 482,600 doses of the Moderna bivalent vaccine have been administered since it was rolled out in Singapore on Oct 14 last year, while more than 202,300 Pfizer-BioNTech bivalent jabs have been given since Dec 12, 2022. ![]() The authority received 59 and 11 adverse event reports for the Moderna/Spikevax COVID-19 bivalent vaccine and Pfizer-BioNTech/Comirnaty COVID-19 bivalent vaccine respectively. SINGAPORE: Adverse effects after the bivalent COVID-19 vaccine shots are rare, according to a Health Sciences Authority (HSA) safety update released on Thursday (Feb 2).
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