The impact of the COVID-19 BNT162b2 vaccine on semen parameters amongst semen donors

In a latest article revealed in Andrology, researchers explored the affect of coronavirus illness 2019 (COVID-19) BNT162b2 (Pfizer) vaccinations on male fertility amongst semen donors (SD) in Israel.

Study: Covid-19 vaccination BNT162b2 temporarily impairs semen concentration and total motile count among semen donors. Image Credit: KateStudio/Shutterstock
Examine: Covid-19 vaccination BNT162b2 temporarily impairs semen concentration and total motile count among semen donors. Picture Credit score: KateStudio/Shutterstock


COVID-19 vaccine growth is a noteworthy medical achievement; nonetheless, the doubtless deleterious results of COVID-19 vaccinations on male fertility have raised some issues. Research have reported that the extreme acute respiratory syndrome coronavirus 2 (SARS-CoV-2) interacts with angiotensin-converting enzyme 2 (ACE2) receptors for entry into host cells and that a number of testicular cells (Sertoli, Leydig, spermatozoa, and spermatogonia) categorical ACE2 receptors.

Moreover, the regulation of autophagy, orchitis, dysfunction, and damage to the blood-testis barrier has been reported to be brought on by the cytokine storm or extreme cytokine manufacturing noticed in SARS-CoV-2 infections. Thus, deleterious results of COVID-19 on the manufacturing of testosterone and spermatogenesis appear to be apparent outcomes; nonetheless, the outcomes of research emphasizing SARS-CoV-2 detection in testis and semen are contradictory.

In regards to the research

Within the current retrospective longitudinal multicenter research, researchers explored the affect of BNT162b2 vaccinations on a number of semen parameters amongst SD in Israel.

The research comprised 220 semen samples of 37 donors from the sperm banks (SB) of Shamir, Sheba, and Herzlyia Medical Facilities, Israel. The research individuals had obtained double BNT162b2 vaccinations, had been (SARS-CoV-2)-negative based mostly on polymerase chain response (PCR) evaluation and/or serological assessments, and didn’t have any signs of SARS-CoV-2 infections.

SD was thought-about vaccinated after one week of the second BNT162b2 vaccination between 1 February 2021 and 16 April 2021. The research was divided into 4 research phases as follows: baseline or pre-vaccination part (T0) encompassing one to 2 semen samples per donor, short-term analysis part (T1), intermediate-term analysis part (T2), and long-term analysis part (T3).

The T1, T2, and T3 phases included one to 3 samples per SD and had been obtained 15 to 45 days, 75 to 120 days, and after >150 days of completion of vaccination, respectively. The modifications in sperm focus, semen quantity, sperm motility, and whole motility depend (TMC) after completion of the BNT162b2 vaccination had been evaluated.

Statistical analyses had been carried out utilizing generalized estimated equation (GEE) modeling and both the paired T-test or the Wilcoxon check. The imply variations between the T1 part, T2 part, and T3 part in comparison with T0 had been evaluated by analyzing 1) solely the preliminary pattern of every SD and; 2) common values of the samples of every SD per part.


Serum samples had been collected from 9, 12, and 16 SD on the sperm banks of Shamir, Sheba, and Herzylia Medical Facilities, which yielded 63 samples, 78 samples, and 79 samples for the evaluation. The common age of the donors was 26 ± 4.2 years. The baseline (T0) serum samples had been obtained previous to vaccination (≤2 serum samples from every SD), and the imply time intervals for pattern assortment after BNT162b2 vaccination was 27 ± 10 days, 93 ± 13 days, and 175 ± 27 days after BNT162b2 vaccination for the T1 part, T2 part, and T3 part, respectively.

In comparison with the T0 part, the sperm focus was lowered by 15.4%, with a 22% discount within the whole motile depend in the course of the T2 part. Likewise, evaluation of solely the primary pattern confirmed reductions in sperm concentrations by 12 x 106/ml and in TMC by 31 x 106 spermatozoa in the course of the T2 part compared to the T0 part.

On contemplating the typical sperm parameter values, the corresponding reductions had been 9.5 x106/ml and 27 x 106 spermatozoa, respectively; nonetheless, the counts recovered in the course of the T3 part, indicating the detrimental results of BNT162b2 vaccination on male fertility had been transient. Of observe, no important modifications in semen quantity and sperm motility had been noticed.


Total, the research findings confirmed that whereas sperm focus lowered after three months of BNT162b2 vaccination with subsequent restoration, sperm motility and semen quantity remained largely unaffected. The findings indicated that BNT162b2 vaccinations had been protected for males of reproductive age within the long-term and help vaccine administration. Nevertheless, additional analysis with potential evaluation of various vaccines and emphasizing subfertility sufferers among the many normal inhabitants fairly than SD should be undertaken.

The authors imagine that the current research is the primary of its type to longitudinally assess semen parameters post-vaccination past the interval of spermatogenesis in males and the research and believed that the transient decline in male fertility was because of the growth of febrile systemic immune responses fairly than direct results of BNT162b2 vaccinations on the testicular cells. 

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