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(CNN) --
A new study adds to mounting evidence showing there's no link between getting the COVID-19 vaccine and having a lower chance of conceiving a baby.
In contrast, couples in the study were slightly less likely to conceive if the man had been infected with coronavirus within 60 days, providing even more reason to get vaccinated against covid-19, as the disease could affect women. short-term male fertility, according to the study published Thursday in the American Journal of Epidemiology.
"These results indicate that male SARSCoV-2 infection may be associated with decreased fertility in the short term and that vaccination against COVID-19 does not impair the fertility of either partner." , researchers from the Boston University School of Public Health and other US institutions wrote in the study.
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"This adds to the evidence from animal studies, studies of humans undergoing fertility treatment, and COVID-19 vaccine trials, none of which found an association between COVID-19 vaccination and lower fertility," the researchers wrote.
"Similarly, several studies have not documented any appreciable association between COVID-19 vaccination and miscarriage risk."
The study included data from 2,126 women, ages 21 to 45, in the United States and Canada.
The women were enrolled in the study from December 2020 to September 2021, and were followed up until November 2021. During the study, the women completed online questionnaires every eight weeks about their reproductive and medical history, among other factors , and they were given the option to invite their male partners to complete questionnaires as well.
Among the participants, 73% of the women and 74% of their male partners had received at least one dose of the vaccine.
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The researchers analyzed the responses to the questionnaire and found no relationship between having been vaccinated and the probability of conceiving a child within one menstrual cycle.
However, the data showed that while having been vaccinated was not strongly associated with the likelihood of conceiving among women, there was an association between male partners who had had covid-19 and a "transient reduction" in the chance of conceiving.
Fertility and covid-19 infection
The National Institutes of Health announced the results of the study on Thursday, noting that couples in which the man had tested positive within 60 days were 18% less likely to conceive in that menstrual cycle, but there were no differences. in the conception rates of couples in which the man had tested positive more than 60 days before a cycle, compared with couples in which the man had not tested positive.
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More research is needed to determine what might be driving these results, but fever is known to lower sperm count and fever is a symptom of Covid-19, according to the NIH.
"The findings provide reassurance that vaccination of couples seeking pregnancy does not appear to impair fertility," Diana Bianchi, MD, director of NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development, said in the announcement. , which financed the study.
"They also provide information for clinicians counseling patients hoping to conceive."
