Vaccine myths regarding infertility

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April 22, 2021

Anti-vaccine groups have repeatedly spread false claims about vaccines causing infertility in the past.  

In regards to claims that COVID-19 vaccines cause infertility, these claims have been promoted by a German anti-vaxxer who falsely claimed that the SARS-CoV-2 spike protein and syncytin-1 are so similar that immunity against one would cross-react with the other — this is completely false and even the German anti-vaxxer who made this up admits that he has no evidence whatsoever to support this claim (see the Seattle Times article, below; it mentions a recent Nature paper about this former physician and his many false claims about vaccines).


As noted in the ACOG website (

"As experts in reproductive health, we continue to recommend that the vaccine be available to pregnant individuals. We also assure patients that there is no evidence that the vaccine can lead to loss of fertility”

Also see the Hopkins website (


MYTH: The COVID-19 vaccine can affect women’s fertility.

FACT: The COVID-19 vaccine will not affect fertility. The truth is that the COVID-19 vaccine encourages the body to create copies of the spike protein found on the coronavirus’s surface. This “teaches” the body’s immune system to fight the virus that has that specific spike protein on it.

Confusion arose when a false report surfaced on social media, saying that the spike protein on this coronavirus was the same as another spike protein called syncitin-1 that is involved in the growth and attachment of the placenta during pregnancy. The false report said that getting the COVID-19 vaccine would cause a woman’s body to fight this different spike protein and affect her fertility. The two spike proteins are completely different and distinct, and getting the COVID-19 vaccine will not affect the fertility of women who are seeking to become pregnant, including through in vitro fertilization methods. During the Pfizer vaccine tests, 23 women volunteers involved in the study became pregnant, and the only one who suffered a pregnancy loss had not received the actual vaccine, but a placebo.

Getting COVID-19, on the other hand, can have potentially serious impact on pregnancy and the mother’s health. Learn more about coronavirus and pregnancy. Johns Hopkins Medicine encourages women to reach out to their medical providers to discuss other questions they have about COVID-19 as it relates to fertility or pregnancy.