The Expert Committee on Clinical Events Assessment Following COVID-19 Immunisation, set up under the Department of Health (DH) to provide independent assessment on the potential causal link between Adverse Events Following Immunisation (AEFIs) and COVID-19 vaccination, convened a meeting today (December 6) to assess serious adverse events relating to COVID-19 vaccination.
According to the World Health Organization, an AEFI is any medical occurrence that follows immunisation and that does not necessarily have a causal relationship with the usage of the vaccine. The DH has put in place a pharmacovigilance system for COVID-19 immunisation, and is partnering with the University of Hong Kong to conduct an active surveillance programme for Adverse Events of Special Interest (AESI) under the COVID-19 Vaccines Adverse Events Response and Evaluation Programme. The main purpose of the pharmacovigilance system is to detect potential signals of possible side effects of the vaccines.
As of November 30, a total of 12 437 persons had been infected with COVID-19 in Hong Kong, of which 213 died. Separately, about 9.46 million doses of COVID-19 vaccines had been administered for members of the public in Hong Kong. Around 4.76 million people had received at least one vaccine dose. In the same period, the DH received 6 437 reports of adverse events (0.07 per cent of total vaccine doses administered), including 49 death cases with vaccination within 14 days before they passed away (0.0005 per cent of total vaccine doses administered).
So far, the Expert Committee had assessed the 49 death cases and concluded that 35 death cases had no causal relationship with vaccination, and preliminarily considered that 14 cases were not associated with vaccination. The Expert Committee considered there is no unusual pattern identified so far, and it will continue to closely monitor the situation and collect data for assessment.
According to the local mortality data, in the period between February 26 and November 30 of 2020, among people aged 30 or above, there were 5 071 deaths (i.e. 92.7 per 100 000 population) and 2 978 deaths (i.e. 54.4 per 100 000 population) due to ischaemic heart diseases and heart disease respectively. In addition, according to information by the Hospital Authority, during the period from November 1 to November 28 of 2021, the ratio of death cases out of those without a vaccination record was 124.7 cases for every 100 000 people, whereas the ratio of death cases for those with a vaccination record was 6.6 cases for every 100 000 people. The overall death rate during this period of time is similar to that recorded in the past three years. Based on the above figures, there is no evidence that vaccination increases the risk of death for recipients.
The Expert Committee has also reviewed available clinical data and information for conducting causality assessment of other serious or unexpected AEFIs and AESIs. These cases included suspected myocarditis cases with serious outcomes following Comirnaty vaccination. The results will be included in the updated safety monitoring report (as at November 30) to be published at the Government's designated website on December 10. In addition, information related to AEFIs of COVID-19 vaccines and relevant statistics will also be released in the weekly "Update on monitoring COVID-19 vaccination" press release and the Government's designated website regularly.
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