Do mRNA vaccines affect male fertility?


FRIDAY June 18, 2021

The Pfizer and Moderna COVID vaccines pose no threat to male fertility, a finding experts hope will prompt more men to get vaccinated.

The researchers noted that the original clinical trials of the two mRNA vaccines did not assess how they might affect fertility.

“Reluctance to the vaccine is a barrier to ending the COVID-19 pandemic, and we believe part of this reluctance is due to public opinion as to whether the vaccine could negatively affect fertility,” said lead author of the study, Dr Ranjith Ramasamy, director of Reproductive Urology. Program at the Miller School of Medicine, University of Miami.

“We were the first to demonstrate that the COVID virus, itself, can affect male fertility and be a potential cause of erectile dysfunction,” he said in an academic press release. “We are now the first to examine whether there is an impact of the COVID vaccine on male fertility potential, which we have not found.”

The study included 45 healthy men between the ages of 18 and 35, who had no fertility issues. They provided a semen sample before receiving the first dose of Pfizer or Moderna vaccine and another sample approximately 70 days after their second dose.

“This is the complete life cycle of sperm and 70 days is enough to see if the vaccine has an impact on sperm parameters,” said study lead author Daniel Gonzalez, Miller medical student. School.

He said measurements of semen volume, sperm concentration and moving sperm showed no drops from initial levels.

Ramasamy said the results – which were posted online June 17 in the Journal of the American Medical Association – could greatly help reduce reluctance to vaccinate.

The study did not evaluate the Johnson & Johnson single dose COVID-19 vaccine.

More information

The United States Centers for Disease Control and Prevention has more information on Vaccines against covid-19.

SOURCE: University of Miami Miller School of Medicine, press release, June 17, 2021

Robert Preidt

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