Pfizer's Covid Vaccine Not Shown To Cause Female Sterilisati
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Social media posts claiming that a Pfizer researcher found that the company’s COVID-19 -19 vaccine will lead to infertility in women but independent medical experts and Pfizer said no sterilisation was documented during clinical trials and the researcher’s Michael Yeadon LinkedIn profile says he has not worked at the American pharmaceutical company since 2011.

Covid-19 Vaccine is female sterilisation, reads the headline of an article, a screenshot of which has been shared across Facebook, Instagram and Twitter since 5 December. Posts making similar claims have been circulating in German and Portuguese.

Yeadon claims that the vaccine, would train the immune system to attack a protein involved in placenta formation, syncytin-1, leading to infertility for women. This is not how the mRNA vaccine works, according to Dasantila Golemi-Kotra, an associate professor in microbiology at York University.

It differs from regular vaccines in that instead of confronting the immune system with part of a virus in a weakened or deactivated form to build antibodies, it gives it a “blueprint” of a part of the virus (the spike protein) that the body can then recognise and fight when confronted by it later.

Dervila Keane, a Pfizer spokeswoman, also said that there is no data to suggest that the Pfizer BioNTech vaccine candidate causes infertility. It has been incorrectly suggested that COVID-19 vaccines will cause infertility because of a very short amino acid sequence in the spike protein of SARS-CoV-2 virus that is shared with the placental protein, syncytin-1.