Abstract
Background As the COVID-19 pandemic persists and new vaccines are developed, concerns among
the general public are growing that both infection with the SARS-CoV-2 virus and
vaccinations against the coronavirus (mRNA vaccines) could lead to infertility
or higher miscarriage rates. These fears are voiced particularly often by young adults
of reproductive age.
This review summarizes the current data on the impact of SARS-CoV-2 infection
and corona vaccinations on female and male fertility, based on both animal models
and human data.
Method A systematic literature search (PubMed, Embase, Web of Science) was carried out using
the search terms “COVID 19, SARS-CoV-2, fertility, semen, sperm, oocyte, male fertility,
female fertility, infertility”. After the search, original articles published
between October 2019 and October 2021 were selected and reviewed.
Results Despite the use of very high vaccine doses in animal models, no negative impacts
on fertility, the course of pregnancy, or fetal development were detected. In humans,
no
SARS-CoV-2 RNA was found in the oocytes/follicular fluid of infected women; similarly,
no differences with regard to pregnancy rates or percentages of healthy children were
found between
persons who had recovered from the disease, vaccinated persons, and controls.
Vaccination also had no impact on live-birth rates after assisted reproductive treatment.
No viral RNA was
detected in the semen of the majority of infected or still infectious men; however,
a significant deterioration of semen parameters was found during semen analysis, especially
after severe
viral disease. None of the studies found that corona vaccines had any impact
on male fertility.
Discussion Neither the animal models nor the human data presented in recent studies provide
any indications that fertility decreases after being vaccinated against coronavirus.
However, there is a growing body of evidence that severe SARS-CoV-2 infection
has a negative impact on male fertility and there is clear evidence of an increased
risk of complications among
pregnant women with SARS-CoV-2 infection. The counseling offered to young adults
should therefore take their fears and concerns seriously as well as providing a structured
discussion of the
current data.
Key words
COVID-19 - corona vaccine - SARS-CoV-2 - reproduction - sperm - oocyte - embryo -
infertility