New Study Reveals COVID-19 Vaccine Benefits for Pregnant Women

A significant study from the University of British Columbia (UBC) has found that COVID-19 vaccination markedly reduces the risks faced by pregnant women and their babies. Published in the journal JAMA, the research indicates that vaccinated pregnant individuals are less likely to suffer severe illness or give birth prematurely. The study, which analyzed nearly 20,000 pregnancies across Canada, provides vital insights for healthcare providers and policymakers.

The findings demonstrate that vaccination correlates with decreased risks of hospitalization, intensive care admission, and preterm birth. These advantages persisted even as the virus evolved from the Delta variant to the Omicron variant, which continues to circulate in newer sublineages.

“Our findings provide clear, population-level evidence that COVID-19 vaccination protects pregnant people and their babies from serious complications,” stated Dr. Deborah Money, a professor of obstetrics and gynaecology at UBC and the study’s senior author. She noted that the benefits of vaccination remained significant despite the virus’s mutations.

Key Findings on Vaccination and Pregnancy

The study was conducted through the national CANCOVID-Preg surveillance network, representing one of the largest datasets globally on COVID-19 and pregnancy. The data revealed that vaccinated individuals were approximately 60% less likely to be hospitalized and 90% less likely to require intensive care compared to their unvaccinated counterparts at the time of infection. Moreover, vaccination linked to fewer premature births—reducing the risk by 20% during the Delta wave and 36% during the Omicron wave.

Notably, the analysis indicated that individuals vaccinated during pregnancy had even lower rates of preterm birth and stillbirth compared to those vaccinated prior to pregnancy. “There is never a bad time to be vaccinated—whether you’re currently pregnant or planning a pregnancy,” explained Dr. Elisabeth McClymont, the study’s lead author and assistant professor in UBC’s department of obstetrics and gynaecology. She emphasized that receiving the vaccine during pregnancy may offer additional benefits.

Implications for Public Health Guidelines

The study arrives at a time when vaccination recommendations for pregnant individuals are evolving. In the United States, the Advisory Committee on Immunization Practices (ACIP) recently did not include a specific recommendation for COVID-19 vaccination during pregnancy in its updated adult immunization schedule. In contrast, public health officials in Canada and the World Health Organization continue to advocate for vaccination among pregnant individuals.

The researchers assert that their findings provide timely evidence to inform ongoing policy discussions. “The body of evidence is overwhelmingly clear: COVID-19 vaccination is safe and effective in pregnancy,” Dr. Money added. “These latest findings provide critical information for pregnant women and their care providers and strongly support public health guidance that recommends vaccination during pregnancy.”

The analysis included data from nine Canadian provinces and one territory, utilizing population-based health data to track outcomes from pregnancies affected by SARS-CoV-2 from April 2021 to December 2022. After adjusting for factors such as age, body mass index, and pre-existing conditions like hypertension or diabetes, vaccination continued to correlate with significantly lower risks of hospitalization.

Beyond the immediate context of COVID-19, the study emphasizes the necessity of including pregnant individuals in vaccine research for future respiratory virus outbreaks. “Pregnancy is a unique period of vulnerability but also of opportunity for prevention,” Dr. McClymont stated. “This study reinforces how vaccination can make a real difference for maternal and newborn health.”

The research received funding from the Public Health Agency of Canada through the COVID-19 Immunity Task Force, the Canadian Institutes of Health Research, and the BC Women’s Health Foundation.