A study of 220 sperm donors looked at semen volume, sperm concentration, sperm motility, and total motile count before vaccination with the Pfizer COVID-19 mRNA vaccine, as well as three times after vaccination up to 150 days.
Authors of the paper published in Andrology found that sperm concentration dropped after vaccination but recovered within 150 days.
Other researchers have pointed out this finding is not consistent with other studies and said that they do not agree the findings are 'clinically significant', published in Newsweek.
Pfizer vaccine temporarily affects semen concentration in sperm donors
Image by Bill McConkey via the Wellcome Collection. Depicts sperm swimming towards an egg.
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