A study published today in Vaccine suggests a strong association between receiving repeated doses of the seasonal influenza vaccine and miscarriage.The authors said the study is an unexpected signal that calls for deeper investigation and highlights the challenges of monitoring the safety of annual vaccines."We are not saying this is a causal relationship," said James Donahue, DVM, PhD, MPH, a senior epidemiologist at the Marshfield Clinic in Wisconsin and the lead author of the study, meaning the data don't necessarily show that the flu vaccine causes miscarriages. "There's no biological basis for this phenomenon, so the study represents something that wasn't expected."In the case-control study conducted over two flu seasons (2010 to 2012), 485 women who experienced spontaneous abortion, or miscarriage, were matched with those who delivered full-term live or stillbirths. Donahue and fellow researchers were determining if spontaneous abortions were more likely to occur if a woman received the flu vaccine in the 28 days prior to the miscarriage.The study was funded by the Centers for Disease Control and Prevention (CDC).Higher incidence after repeat vaccineThe 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 7.7, while women not vaccinated in the previous season had aOR of 1.3. This heightened association was seen in both seasons studied.The overall aOR in the 28-day window was 2.0, or double the risk, but those findings, in contrast to the H1N1 subset, were not statistically significant. There was no association seen in any other exposure window."In a previous study conducted on flu vaccine and miscarriage, we did not see a risk," said Donahue, referring to research conducted from 2005 to 2007. That study was conducted after the CDC made the recommendation 2004 that all pregnant woman in all trimesters get the seasonal flu shot. The CDC requested a follow-up study after the 2009 H1N1 pandemic."We can speculate that what we see here is vaccination with H1N1pdm09 for the first time is like getting primed, then boosted," said Donahue. "But now H1N1 is just a circulating seasonal virus; most children and young adults have been exposed by infection or vaccination." In other words, there may have been a real effect in the seasons immediately following the 2009 pandemic, but further study will fail to show this association.Donahue and his colleagues are working on a follow-up study that looks at more recent flu seasons and triples the number of cases.
結果 (
日本語) 1:
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ワクチンで、今日発表された研究は、季節性インフルエンザワクチンと流産の反復投与を受けたとの間に強い関連性を示唆しています。<br><br>著者は、研究はより深い調査とハイライト毎年ワクチンの安全性を監視する挑戦を求めて予想外の信号であると述べました。<br><br>「私たちは、これが因果関係であると言っていない、」ジェームズ・ドナヒュー、DVM、博士、MPH、ウィスコンシン州マーシュフィールドクリニックと研究の主執筆者でシニア疫学者は必ずしもインフルエンザいることを示していないデータを意味し、言いましたワクチンは、流産の原因となります。「研究が期待されていなかった何かを表して、この現象には、生物学的根拠はありません。」<br><br>In the case-control study conducted over two flu seasons (2010 to 2012), 485 women who experienced spontaneous abortion, or miscarriage, were matched with those who delivered full-term live or stillbirths. Donahue and fellow researchers were determining if spontaneous abortions were more likely to occur if a woman received the flu vaccine in the 28 days prior to the miscarriage.<br><br>The study was funded by the Centers for Disease Control and Prevention (CDC).<br><br>Higher incidence after repeat vaccine<br>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 7.7, while women not vaccinated in the previous season had aOR of 1.3. This heightened association was seen in both seasons studied.<br><br>The overall aOR in the 28-day window was 2.0, or double the risk, but those findings, in contrast to the H1N1 subset, were not statistically significant. There was no association seen in any other exposure window.<br><br>"In a previous study conducted on flu vaccine and miscarriage, we did not see a risk," said Donahue, referring to research conducted from 2005 to 2007. That study was conducted after the CDC made the recommendation 2004 that all pregnant woman in all trimesters get the seasonal flu shot. The CDC requested a follow-up study after the 2009 H1N1 pandemic.<br><br>"We can speculate that what we see here is vaccination with H1N1pdm09 for the first time is like getting primed, then boosted," said Donahue. "But now H1N1 is just a circulating seasonal virus; most children and young adults have been exposed by infection or vaccination." In other words, there may have been a real effect in the seasons immediately following the 2009 pandemic, but further study will fail to show this association.<br><br>ドナヒューと彼の同僚は、より最近のインフルエンザの季節のルックスとは例数を3倍というフォローアップ研究に取り組んでいます。
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