Are COVID-19 Vaccines Going To Cause Infertility?

The short version: Someone has claimed that the COVID-19 vaccines are going to cause infertility because of a shared amino acid sequence in the spike protein of SARS-CoV-2 and a placental protein, which will make the immune system attack both as it can’t tell the difference. The truth? This sequence is too short for the immune system to meaningfully confuse it with placental proteins. It’s sort of like saying that you are going to be confused with a criminal because you wear a commonly sold red bracelet that was also found on the criminal. It’s not realistic. If this were true, we would also expect COVID-19 to cause early pregnancy loss a significant amount of the time. The evidence available to us does not support that this is the case. There is no reasonable basis to believe that vaccines against COVID-19/SARS-CoV-2 will affect fertility.

  1. T-2 independent (TI-2): Antigens that can cross-link a B cell receptor (immunoglobulin) to activate B cells without the need for T cell help. This mostly applies to carbohydrate antigens which have many repeating units of a sugar sequence.

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I write about vaccines here. You can find me on Twitter @enirenberg and at deplatformdisease.com (where I publish the same content without a paywall)