2009 H1N1 Vaccine Safety in Pregnancy
Author Information
Author(s): Huang Wan-Ting, Chen Wan-Chin, Teng Hwa-Jen, Huang Wei-I, Huang Yu-Wen, Hsu Chien-Wen, Chuang Jen-Hsiang
Primary Institution: Taiwan Centers for Disease Control
Hypothesis
What are the adverse events following 2009 H1N1 vaccination in pregnant women?
Conclusion
The findings were reassuring for the safety of 2009 H1N1 vaccines in pregnancy.
Supporting Evidence
- 16 spontaneous abortions were verified following vaccination.
- The estimated risk of spontaneous abortion was 2.3 per 100 pregnancies.
- Passive surveillance provided rapid assessment of adverse events.
- Most adverse events were consistent with those from seasonal influenza vaccines.
- Data on MF59®-adjuvanted vaccine exposure during pregnancy was limited.
Takeaway
This study looked at how safe the 2009 H1N1 vaccine is for pregnant women, and it found that the vaccine is generally safe.
Methodology
The study used passive surveillance to collect reports of adverse events following vaccination and matched them to a large-linked database for analysis.
Potential Biases
There is a risk of bias due to the healthy vaccinee phenomenon, where healthier individuals may be more likely to receive the vaccine.
Limitations
The study relied on passive surveillance, which may lead to underreporting of adverse events.
Participant Demographics
The median maternal age was 34 years, with a range of 18 to 42 years.
Statistical Information
Confidence Interval
95% CI, 196–553
Digital Object Identifier (DOI)
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