The Department of Health today said it received two reports from the Hospital Authority of a suspected adverse event following immunisation with a COVID-19 vaccine concerning two suspected miscarriage cases.

One of the cases involved a 32-year-old woman who could not give a clear account of her pregnancy information.

According to the authority, the woman tested pregnant on April 10 and experienced vaginal bleeding and lower abdominal pain and expelled her foetus the next day.

She attended Queen Mary Hospital’s accident and emergency department for medical advice and her foetus was certified dead on the same day.

According to the authority’s assessment of the gestational age of the foetus by weight, it was estimated to be around 23 to 24 weeks old.

The woman received a dose of the Comirnaty COVID-19 vaccine at the St Paul's Hospital community vaccination centre on April 8 and there was no record of her feeling unwell during observation at the centre.

The second case involved another 32-year-old woman. She tested pregnant on March 25 and sought medical treatment at Queen Elizabeth Hospital’s accident and emergency department on March 31 due to vaginal bleeding. After assessment, she was found to have had a miscarriage.

She received a dose of the Comirnaty COVID-19 vaccine at the Choi Hung Road Badminton Centre community vaccination centre on March 23 and there was no record of her feeling unwell during observation at the centre.

The department has contacted the authority to obtain more information for assessment, adding there is currently no evidence indicating that the two cases were related to vaccination.

It will pass the cases to the Expert Committee on Clinical Events Assessment Following COVID-19 Immunisation for causality assessment.

The department noted that the Comirnaty vaccination fact sheet states that COVID-19 vaccines are not routinely recommended during pregnancy, unless the woman is considered to be at very high risk of SARS-CoV-2 exposure and subject to very high risk of COVID-19 complications.

Women who are pregnant or breastfeeding, think they may be pregnant or are planning to have a baby should ask their doctor for advice before receiving the Comirnaty vaccine.

Meanwhile, the CoronaVac vaccination fact sheet states that the CoronaVac jab should not be given to pregnant women.