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Vaccine experts think the results may reflect the older age and other miscarriage risks for the women and not the flu shots. I have gotten a flu shot every year since I was a child so this thought didnt cross my mind until I read your post.
Belongia said while its not clear whether flu shots could increase the risk of miscarriage it is known that contracting the flu.
Flu shot and miscarriage. Of the women who miscarried 17 had received flu vaccine in the 28 days before the miscarriage and had also been immunised the prior flu season. Most miscarriages occurred in the first trimester. The investigators found no association between miscarriage and flu vaccine if a woman had not received a vaccine in the previous year but in women who had consecutively gotten a flu vaccine containing the 2009 H1N1 virus the researchers found an adjusted odds ratio aOR of 77 while women not vaccinated in the previous season had aOR of 13.
In September 2017 a study found a link between miscarriage and getting a flu shot during the first trimester of pregnancy. It doesnt prove that the flu shot causes miscarriages. Its also just one preliminary study so it doesnt change existing recommendations.
Doctors say pregnant women should still get the flu shot. Can flu vaccination result in miscarriage. Multiple studies have shown that women who have gotten flu shots during pregnancy have not had a higher risk for spontaneous abortion miscarriage.
One of the largest and strongest studies external icon was conducted in CDCs Vaccine Safety Datalink VSD project. They then studied whether and when the women received a flu shot during pregnancy. The study did not specify when the women who got flu shots were vaccinated but it stated that many received a flu shot within 28 days of the miscarriage and also received a flu shot during the previous years flu season.
Both figures showed a statistically significant increase in miscarriages when women received their flu shot. The median gestational age for spontaneous abortion was 7 weeks in the affected pregnancies. I have gotten a flu shot every year since I was a child so this thought didnt cross my mind until I read your post.
I found out I was pregnant at 5 weeks. I got a flu shot at the appointment when I found out I was pregnant. I had a miscarriage 1 week later.
Could just be a fluke and coincidence however I wanted to share my story. Study Confirms Link Between Flu Vax and Miscarriage. 150 Healthcare Workers Fired for Refusing Flu Shot.
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A puzzling study of US. Pregnancies found that women who had miscarriages between 2010 and 2012 were more likely to have had back-to-back annual flu shots that included protection against swine flu. Vaccine experts think the results may reflect the older age and other miscarriage risks for the women and not the flu shots.
Flu shot and miscarriage You may have heard of a link between the flu vaccine and miscarriage. A 2017 study on this topic suggested that miscarriage is more common in the 28 days following the flu. As reported by Helen Branswell with Stat News this new finding contradicts a previous small observational study by the same researchers.
The new study was much larger and specifically designed to look at the flu shot-miscarriage relationship. Additionally earlier studies did not find a link between flu vaccination and miscarriage. This is after all flu shot season in the Northern Hemisphere.
Belongia said while its not clear whether flu shots could increase the risk of miscarriage it is known that contracting the flu. A study using VSD data Irving et al 2013 external icon found no increased risk of miscarriage among pregnant women who received flu vaccines in the 2005-06 or 2006-07 flu seasons. Experts dont believe a shot made from killed flu virus could trigger an immune system response severe enough to prompt a miscarriage and antibodies dont cross the placenta in the first.
Of the women who miscarried 17 had received flu vaccine in the 28 days before the miscarriage and had also been immunized the prior flu season. The authors chose two flu seasons 2010 to 2012 and asked if women who had miscarriages were more likely to have been vaccinated for influenza within 28 days prior to miscarriage as well as for different time periods before miscarriage. The most critical aspect of any case control study if of course the matching of cases to controls.
Flu Vaccination Linked to Eightfold Risk of Miscarriage Importantly research 43 44 funded by the CDC itself linked flu vaccination during early pregnancy to an eightfold risk of miscarriage. In all 485 pregnant women aged 18 to 44 who had a miscarriage during the flu seasons of 20102011 and 20112012 were compared to 485 pregnant women who carried to term. Flu Shot Wont Cause Miscarriage Study Confirms From the WebMD Archives FRIDAY March 1 2019 HealthDay News A flu shot cannot cause a pregnant woman to.