READ | Novavax covid-19 vaccine shows 90% efficacy in US phase 3 trialThe participants were pre-screened to ensure they had no underlying fertility issues.
Those with COVID-19 symptoms or a positive test result within 90 days were excluded.The men provided a semen sample after two to seven days of abstinence, prior to receiving the first vaccine dose and approximately 70 days after the second shot.Semen analyses were performed by trained andrologists as per World Health Organization guidelines and included semen volume, sperm concentration, sperm motility, and total motile sperm count (TMSC)."One of the reasons for vaccine hesitancy is the potential negative effect on fertility," the authors of the study from the University of Miami in the.