Thursday, December 9

Researchers are unable to agree on menstrual changes and the vaccine is linked.

A new study from the UK fails to find a connection. An American study shows the opposite. It is still not known whether the coronary vaccine can affect menstruation.

Thousands of women have reported changes in their menstrual cycle after taking the vaccine. But the researchers can not agree on whether there is actually a connection between the two.

More than 40,000 British women have reported changes in their period to the health authorities after receiving the coronary vaccine.

The same thing happened in several countries, and in Norway more than 1,400 women have reported to the Norwegian Medicines Agency.

It created great interest in the problem. A number of studies have been initiated to find out if there is actually a link between the vaccine and the change in menstruation.

But so far the results point in different directions. Some say yes. Others say no.

Now the result of a new British study is ready.

– I went into this study and thought it would be a link. But the data did not support my hypothesis, so I changed my mind. That’s how science works, writes researcher Victoria Male in an email to Aftenposten.

Further down in the case, the National Institute of Public Health points out the weaknesses of the studies that have come so far. They believe the Norwegian study that is underway is better than the others.

No connection found

1273 women have participated in studies, which was conducted at Imperial College London.

These are women with a good overview of their cycles. Which usually tend to jot down when and how they bleed. Who has received a vaccine from the AstraZeneca, Moderna, Pfizer or Janssen vaccine.

This information was collected and compared with the time they took the vaccine.

Earlier, the immunologist who led the study, Victoria Male, commented to TV2 on the topic. Then she thought that there is a strong connection between the vaccine and changes in the cycle in women. Now she has changed her mind.

“We were unable to find clear signals to support the idea that the covid-19 vaccine is linked to changes in the time or size of women’s menstruation,” the study concludes.

The study was published on medRivx. Medical research articles can be published there before they have been evaluated by other experts, which is a common way to ensure the quality of research.

Can still be a link

The new study thus comes to the same conclusion as the European Medicines Agency (EMA) and the British Medicines Agency (MHRA).

– But it is possible that larger surveys, surveys where women are recruited before the vaccination, or studies in other countries, can find links, it says in her report.

And this is exactly what a major study from the United States that came out in October did.

Trans men got bleeding

Kathryn Clancy is a professor at the University of Illinois. In February, she asked her Twitter followers if they experienced changes in their period after taking the vaccine.

The response was so overwhelming that it became a study on the subject.

In October, she and her colleagues published the result. This too has been published on medRivx and has not been peer-reviewed yet.

More than 92,000 women and transgender people with female genitals answered the researchers’ questionnaires. They did so after taking the vaccine.

42 percent of women who normally had a normal cycle experienced heavier bleeding just after taking the vaccine.

39 percent of transgender people on sex-confirming hormones, and 66 percent of women who had undergone menopause experienced bleeding.

Different results on the research

Male believes that there may be different reasons why the studies come to such different results.

One is about which participants are recruited for the survey, and how. One can recruit women who has experienced bleeding changes, or all women who have taken the vaccine. And you can recruit people before or after they have taken the vaccine.

Depending on what one chooses, the survey may have what is called a confirmation bias or recruitment bias. This means that the survey shows you the result you want, or that you do not get a representative sample of participants.

The second is about the basis for comparison of the researchers. If they see if the bleeding is “out of the ordinary”, they must define what is normal.

60,000 Norwegian women in the survey

In Norway, the National Institute of Public Health (NIPH) conducts a survey of 60,000 women. It should also look at whether altered menstruation is a side effect of the vaccine.

Lill-Iren Schou Trogstad at FHI is the doctor and project manager for the study. She writes in an email to Aftenposten that they are now working full time to analyze the data they have received, and they expect to have the first results during the year.

She believes there are challenges associated with both the English and the American study. To give a good answer, one must examine and compare those who have taken the vaccine and those who have not taken the vaccine. And the selection must be random.

The Norwegian study does both of these things.

– In order to give a good answer, we must conduct well-designed surveys in a representative sample of the population, Trogstad writes.

– What happens next if you find a connection?

– We do not have the results ready yet and can therefore not draw conclusions, she writes.

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