Tags

Type your tag names separated by a space and hit enter

Perinatal survival and health after maternal influenza A(H1N1)pdm09 vaccination: A cohort study of pregnancies stratified by trimester of vaccination.
Vaccine. 2015 Sep 11; 33(38):4850-7.V

Abstract

Large cohort studies demonstrated the safety of vaccination with the AS03 adjuvanted pandemic influenza vaccine, but data on first trimester vaccination safety are limited. We conducted a nationwide register-based retrospective cohort study in Finland, included singleton pregnancies present on 01 November 2009 and followed them from 01 November 2009 until delivery. Pregnancies with abortive outcome, pregnancies that started before 01 February 2009 and pregnancies of women, who received the AS03 adjuvanted pandemic influenza vaccine prior to the onset of pregnancy, were excluded. Our main outcome measures were hazard ratios comparing the risk of stillbirth, early neonatal death, moderately preterm birth, very preterm birth, moderately low birth weight, very low birth weight, and being small for gestational age between pregnancies exposed and unexposed to maternal influenza A(H1N1)pdm09 vaccination. The study population comprised 43,604 pregnancies; 34,241 (78.5%) women were vaccinated at some stage during pregnancy. The rates of stillbirth, early neonatal death, moderately preterm birth, and moderately low birth weight were similar between pregnant women exposed and unexposed to influenza A(H1N1)pdm09 vaccination. After adjusting for known risk factors, the relative rates were 0.90 (95% confidence interval 0.55-1.45) for very preterm birth, 0.84 (0.61-1.16) for very low birth weight, and 1.17 (0.98-1.40) for being small for gestational age. Also, in the subanalysis of 7839 women vaccinated during the first trimester, the rates did not indicate that maternal vaccination during the first trimester had any adverse impact on perinatal survival and health. The risk of adverse pregnancy outcomes was not associated with the exposure to the AS03 adjuvanted pandemic influenza vaccine. This study adds reassuring evidence on the safety of AS03 adjuvanted influenza vaccines when given in the first trimester and supports the recommendation of influenza vaccination to all pregnant women through all stages of pregnancy.

Authors+Show Affiliations

National Institute for Health and Welfare, P.O. Box 30, FI-00271 Helsinki, Finland. Electronic address: ulrike.baum@thl.fi.National Institute for Health and Welfare, P.O. Box 30, FI-00271 Helsinki, Finland.National Institute for Health and Welfare, P.O. Box 30, FI-00271 Helsinki, Finland.National Institute for Health and Welfare, P.O. Box 30, FI-00271 Helsinki, Finland.National Institute for Health and Welfare, P.O. Box 30, FI-00271 Helsinki, Finland.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26238723

Citation

Baum, Ulrike, et al. "Perinatal Survival and Health After Maternal Influenza A(H1N1)pdm09 Vaccination: a Cohort Study of Pregnancies Stratified By Trimester of Vaccination." Vaccine, vol. 33, no. 38, 2015, pp. 4850-7.
Baum U, Leino T, Gissler M, et al. Perinatal survival and health after maternal influenza A(H1N1)pdm09 vaccination: A cohort study of pregnancies stratified by trimester of vaccination. Vaccine. 2015;33(38):4850-7.
Baum, U., Leino, T., Gissler, M., Kilpi, T., & Jokinen, J. (2015). Perinatal survival and health after maternal influenza A(H1N1)pdm09 vaccination: A cohort study of pregnancies stratified by trimester of vaccination. Vaccine, 33(38), 4850-7. https://doi.org/10.1016/j.vaccine.2015.07.061
Baum U, et al. Perinatal Survival and Health After Maternal Influenza A(H1N1)pdm09 Vaccination: a Cohort Study of Pregnancies Stratified By Trimester of Vaccination. Vaccine. 2015 Sep 11;33(38):4850-7. PubMed PMID: 26238723.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Perinatal survival and health after maternal influenza A(H1N1)pdm09 vaccination: A cohort study of pregnancies stratified by trimester of vaccination. AU - Baum,Ulrike, AU - Leino,Tuija, AU - Gissler,Mika, AU - Kilpi,Terhi, AU - Jokinen,Jukka, Y1 - 2015/08/01/ PY - 2015/05/21/received PY - 2015/07/13/revised PY - 2015/07/21/accepted PY - 2015/8/5/entrez PY - 2015/8/5/pubmed PY - 2016/6/9/medline KW - Pandemic influenza A(H1N1) KW - Perinatal health KW - Perinatal survival KW - Pregnancy KW - Trimester KW - Vaccination KW - Vaccine safety SP - 4850 EP - 7 JF - Vaccine JO - Vaccine VL - 33 IS - 38 N2 - Large cohort studies demonstrated the safety of vaccination with the AS03 adjuvanted pandemic influenza vaccine, but data on first trimester vaccination safety are limited. We conducted a nationwide register-based retrospective cohort study in Finland, included singleton pregnancies present on 01 November 2009 and followed them from 01 November 2009 until delivery. Pregnancies with abortive outcome, pregnancies that started before 01 February 2009 and pregnancies of women, who received the AS03 adjuvanted pandemic influenza vaccine prior to the onset of pregnancy, were excluded. Our main outcome measures were hazard ratios comparing the risk of stillbirth, early neonatal death, moderately preterm birth, very preterm birth, moderately low birth weight, very low birth weight, and being small for gestational age between pregnancies exposed and unexposed to maternal influenza A(H1N1)pdm09 vaccination. The study population comprised 43,604 pregnancies; 34,241 (78.5%) women were vaccinated at some stage during pregnancy. The rates of stillbirth, early neonatal death, moderately preterm birth, and moderately low birth weight were similar between pregnant women exposed and unexposed to influenza A(H1N1)pdm09 vaccination. After adjusting for known risk factors, the relative rates were 0.90 (95% confidence interval 0.55-1.45) for very preterm birth, 0.84 (0.61-1.16) for very low birth weight, and 1.17 (0.98-1.40) for being small for gestational age. Also, in the subanalysis of 7839 women vaccinated during the first trimester, the rates did not indicate that maternal vaccination during the first trimester had any adverse impact on perinatal survival and health. The risk of adverse pregnancy outcomes was not associated with the exposure to the AS03 adjuvanted pandemic influenza vaccine. This study adds reassuring evidence on the safety of AS03 adjuvanted influenza vaccines when given in the first trimester and supports the recommendation of influenza vaccination to all pregnant women through all stages of pregnancy. SN - 1873-2518 UR - https://www.unboundmedicine.com/medline/citation/26238723/Perinatal_survival_and_health_after_maternal_influenza_A_H1N1_pdm09_vaccination:_A_cohort_study_of_pregnancies_stratified_by_trimester_of_vaccination_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0264-410X(15)01022-1 DB - PRIME DP - Unbound Medicine ER -