Conclusion
Our findings showed that the level of antibody peaked at two months
after either vaccination or infection, and a booster-like effect was
observed following a recent SARS-CoV-2 infection. Our results suggest
that a booster dose of the vaccine during the third trimester can
provide maximum transplacental protection against both the Wuhan
wild-type strain and Omicron variant. Based on these results, we
encourage pregnant women to receive vaccination during pregnancy with a
focus on the third trimester for optimal protection.