According to an article published in BBC, Claims on social media that the Covid vaccine could affect female fertility are unfounded, experts have said.
Reply to Media Posts
Posts have incorrectly suggested the Pfizer vaccine could cause infertility in women, or cause their bodies to attack the placenta.
But there is no “plausible biological mechanism” by which the vaccine could affect your fertility, says Prof Lucy Chappell, a professor in obstetrics at King’s College London and spokesperson for the Royal College of Obstetricians and Gynaecologists.
Vaccine Working
The vaccine works by sending a message to the body with a blueprint, allowing it to manufacture a small, harmless fragment of the coronavirus’s distinctive “spike”.
This prompts your immune system to kick into action, producing antibodies and white blood cells to fight off the virus – and recognising it if you encounter it again.
It can’t give you the virus, and it has no way of affecting your own genetic information.
These “messenger particles” are extremely short-lived: they deliver their message and then they are destroyed. That’s why the Pfizer vaccine in particular has to be stored so carefully – the genetic material it contains falls apart and becomes useless very easily.
Impact of Pfizer Vaccine
Prof Nicola Stonehouse, a virologist at the University of Leeds, said there was no possible way she could think of that this could have an impact on reproductive health.
Online, some people have pointed to a line in an earlier version of guidance published by the UK government stating it was “unknown” whether the Pfizer vaccine had an impact on fertility. This has since been updated to clarify that animal studies don’t indicate any harmful effects on the reproductive system.
Evidence of Scientists
Part of the confusion here is down to how scientists describe things compared with how most of us would understand them in our daily lives.
When scientists say there is “no evidence” they mean there hasn’t yet been a long-term study on this specific vaccine – but that doesn’t mean there are no facts here at all or we’re shooting in the dark.
Fertility Issues
In fact, Prof Chappell pointed out, there is lots of evidence from other non-live virus vaccines, including the flu jab, that they have no impact on fertility and are completely safe and recommended for use during pregnancy.
And getting the Covid virus itself – which the vaccine protects against – has the potential to affect fertility, so “you’re much more likely to have fertility issues post-Covid than after the vaccine,” Prof Stonehouse said.
Vaccine rumours
Some of the rumours have suggested the vaccine could threaten fertility because it contains proteins also used to make the placenta. Posts on social media have claimed this could lead the body to attack the placenta.
This is not true – the vaccine does contain a protein which slightly resembles one used in the development of the placenta but it’s not similar enough to confuse the body.
Distinct proteins in Vaccines
Vaccines are designed around the most distinctive parts of the virus’s spike to make sure it recognises only that.
The fact that the respective proteins bear a passing resemblance “doesn’t mean anything”, says Prof Chappell, since there are lots of similar proteins existing in different places in nature – it’s their precise length and sequence that makes them distinctive.
Pregnancy Concerns
Prof Chappell, who specialises in the health of pregnant women and people hoping to conceive, said she had “no concerns” about fertility and the Covid vaccine.
And the deputy chief medical officer for England, Jonathan Van-Tam, when answering questions from BBC viewers, said: “I have never heard of a vaccine that affects fertility.”
He described the suggestion as “a nasty, pernicious scare story, but that’s all it is”.
Drugs in Vaccines
During pregnancy women are understandably very concerned about their health and may be conscious of scandals such as the one surrounding thalidomide – a drug used for morning sickness, that affected thousands of babies, leaving many with impaired limb development.
But as a direct result of these experiences, our understanding and treatment of drugs during pregnancy is entirely different.
Cautioned Pregnancy Vaccines
The advice on treatments during pregnancy is extremely cautious.
And pregnant women are generally not included in clinical trials – including those for the Covid vaccine.
Though vaccines are quite different from powerful drugs like thalidomide, most health services are erring on the side of caution.
They are generally not recommending pregnant women have the jab unless they are at particular risk from Covid.
That might be because they are highly exposed to the virus in their jobs, or at high risk of becoming very sick if they contracted Covid due to health conditions.
Vaccination Risks
The UK government says: “The vaccines have not yet been tested in pregnancy, so until more information is available, those who are pregnant should not routinely have this vaccine.”
Like all things in healthcare, there is an element of balancing risks. Even something as simple as an over-the-counter painkiller carries a tiny risk of ulcers and internal bleeding. But the risk for most people is so small when used correctly, that it is outweighed by the benefits of treating relatively mild pain.
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