Good news fellas! mRNA COVID-19 vaccines don't appear to harm your swimmers
Observational study: A study in which the subject is observed to see if there is a relationship between two or more things (eg: the consumption of diet drinks and obesity). Observational studies cannot prove that one thing causes another, only that they are linked.
People: This is a study based on research using people.
COVID-19 mRNA vaccines, such as Pfizer and Moderna, don't appear to negatively impact men's sperm, with a US study showing the characteristics of men's swimmers don't decline after having the COVID-19 vaccines. The small study of 45 men looked at a host of sperm characteristics including motility and sperm counts both before and after the COVID-19 vaccines, and showed no decline in any of the sperm characteristics they measured. In fact if anything the study showed a small improvement in some characteristics after vaccination, but the authors say the size of this change is within normal individual variation.
Journal/conference: JAMA
Link to research (DOI): 10.1001/jama.2021.9976
Organisation/s: University of Miami, USA
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