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Covid affects testicles, reducing sperm quality, says study

Publicado em 03 setembro 2021

While following, since the beginning of last year, male patients who had covid-19, andrologist Jorge Hallak, a professor at the Faculty of Medicine of the University of São Paulo (FM-USP), began to observe that the results of fertility tests and their hormones remain altered for many months after they recover from the disease.

Despite being an initial test and not being able to diagnose fertility or infertility, the sperm count of several patients has indicated, for example, that sperm motility – the ability of sperm to move and fertilize the egg, whose normal index is above 50% – fell to between 8% and 12% and remained at that level almost a year after being infected with SARS-CoV-2.

Hormonal tests indicate that the testosterone levels of many of them also plummeted after the illness. While the normal level of this hormone is 300 to 500 nanograms per deciliter of blood (ng/dL), in patients who had covid-19 this index ranged below 200 and often stayed between 70 and 80 ng/dL

“We have increasingly seen prolonged changes in the quality of semen and hormones in patients who had covid-19, even in those who presented mild or asymptomatic symptoms”, says Hallak to Agência FAPESP.

Some studies carried out by the researcher in collaboration with colleagues from the Department of Pathology at FM-USP, published in recent months, have helped to elucidate these observations made in clinical practice.

The researchers found that SARS-CoV-2 also infects the testes, impairing the ability of male gonads to produce sperm and hormones.

“It is very worrying how the new coronavirus affects the testes, even in asymptomatic or mildly symptomatic cases of the disease. Among all the agents harmful to the testes that I have studied to date, SARS-CoV-2 seems to be very active”, says Hallak. “Each pathology has particularities that practice and experience show us. SARS-CoV-2 has the characteristic of affecting spermatogenesis in ways that we are now discovering, such as persistently very low progressive motility, without significant change in sperm concentration”, he says. .

In a study of 26 patients who had covid-19, researchers found through ultrasound examinations that more than half of them had severe inflammation in the epididymis – the structure responsible for storing sperm and where they acquire the ability to move.

The patients have an average age of 33 years and are treated at the Hospital das Clínicas at FM-USP and at the Androscience Institute. The results of the study, supported by FAPESP, were published in the journal Andrology.

“Unlike a classic bacterial infection or by other viruses, such as mumps, which causes swelling and pain in the testicles in one third of those affected, epididymitis caused by the new coronavirus is painless and cannot be diagnosed by palpation [exame físico] or with the naked eye,” explains Hallak.

Therefore, according to him, it would be interesting to teach the self-examination of the testicles as a public health policy in the post-pandemic.

“It is ideal that adolescents, young adults and men of age or with reproductive desire, after being infected by SARS-CoV-2, seek a urologist or andrologist and make an appointment with measurement of testicular volume, measurement of testosterone and other hormones , in addition to semen analysis with sperm function tests, followed by an ultrasound examination with color Doppler, to check for any type of testicular involvement that can affect fertility and hormone production,” suggests Hallak.

“These individuals must be followed up for one to two years after the infection, at least, because we still don’t know how the disease evolves”, he points out.

Testicular cell invasion

Another study recently published by the same group of researchers and also supported by FAPESP indicated that SARS-CoV-2 invades all types of testicular cells, causing lesions that can impair hormonal function and male fertility.

Through a project coordinated by FM-USP professors Paulo Saldiva and Marisa Dolhnikoff, minimally invasive autopsy techniques were used to extract testicular tissue samples from 11 men, aged between 32 and 88 years, who died at the HC-FM- USP due to severe covid-19.

The results of the analyzes indicated a series of testicular lesions that can be attributed to inflammatory alterations that reduce the production of sperm (spermatogenesis) and hormones.

“What immediately caught our attention in these patients who died as a result of covid-19 was the drastic decrease in spermatogenesis. Even the youngest, of childbearing age, had practically no sperm”, says Amaro Nunes Duarte Neto, infectologist and pathologist FM-USP and Instituto Adolfo Lutz and coordinator of the study.

According to the researcher, some of the probable causes of the decrease in spermatogenesis in these patients were lesions caused by the virus in the testicular parenchyma vessels, with the presence of thrombi, which led to hypoxia – lack of oxygenation in the tissues -, in addition to fibrosis that obstruct the tubules seminiferous, where sperm are produced.

One of the probable reasons for the hormonal decrease is the loss of Leydig cells, which are found between the seminiferous tubules and produce testosterone.

“The functions of the testes to produce sperm and male sex hormones are independent, but there is an interconnection between them. If the production of hormones by Leydig cells is impaired, fertility will also be reduced,” says Duarte Neto.

Some of the symptoms of testosterone deficiency (hypogonadism) are muscle loss, tiredness, irritability, memory loss, and weight gain, which can be mistaken for the long-term effects of covid-19.

“An important part of this clinical picture is certainly related to low testicular function. But this has not yet been addressed because patients do not have pain and it is not usual to measure hormones or analyze sperm after they recover from COVID-19 “, warns Hallak.

The researchers plan to conduct a follow-up study of male patients who have had the disease to assess how long it takes for testicular damage caused by SARS-CoV-2 to be reversed naturally or through drug administration.

“We still don’t know if these testicular injuries can be reversed and how long it will take for them to happen,” says Hallak.

The researcher’s main concerns are in relation to men of reproductive age, adolescents and prepubescents, for whom there is still no data on testicular lesions caused by covid-19. It is not known what the impacts will be on puberty in relation to the fertile capacity, whether hormone production will be affected in a transient, prolonged or definitive way, and what is the degree of irreversible residual damage.

As there are no SARS-CoV-2 pre-infection data for each individual, prospective studies should include a control group for comparison purposes, suggests Hallak.

“These individuals may have infertility problems and hormonal changes in the future and not know that this could have been caused by the covid-19 infection, because they had mild symptoms or were asymptomatic”, he ponders.

Increased male infertility

The researcher estimates that covid-19 could cause an increase in male infertility. Currently, between 15% and 18% of couples face difficulties in conceiving – due to male problems in 52% of cases.

This scenario can trigger a greater search for assisted reproduction techniques which, according to him, is sometimes rushed in Brazil for male causes, without adequate and standardized initial assessment and often without establishing the causative diagnosis initial and without enough time to propose approaches based on the best cost-benefit and the application of specific treatments that can cure the cause or restore the natural fertile capacity.

“You will have to be very careful with post-pandemic assisted reproduction of covid-19, as the consequences of this in the months following the infection are not known,” Hallak points out.

Since SARS-CoV-2 has been detected in all testicular cell types, which participate in all stages of spermatogenesis, it is not known whether the virus may also be present in sperm from patients who had covid-19 months after they have recovered from the illness.

These spermatozoa may have been affected by the virus and, ideally, at least one spermatogenesis cycle – around 90 days – should be preventively carried out before a new andrological investigative evaluation can be carried out, says Hallak.

“We have seen very high DNA damage caused by the new coronavirus, around 80%, while the normal is up to 25% and, acceptable, up to 30%”, he compares.

Another concern of the researcher is the replacement of testosterone in these patients who had covid-19 and hormonal decline, which, according to him, is an unnecessary measure.

“Testosterone replacement in an already affected patient will further inhibit testicular function. The testes have repair mechanisms to return to producing hormones and there are drug treatments that increase the natural production of steroid hormones, progressively restoring the individual’s intrinsic testicular function . This will also depend on whether there was damage to Leydig cells and to what degree, which is something we don’t know yet,” he ponders.

The article Radiological patterns of incidental epididymitis in mild-to-moderate COVID-19 patients revealed by color Doppler ultrasound (DOI: 10.1111/and.13973), by Felipe Carneiro, Thiago A. Teixeira, Felipe S. Bernardes, Marcelo S Pereira, Giovanna Milani, Amaro N. Duarte-Neto, Esper G. Kallas, Paulo HN Saldiva, Maria C. Chammas and Jorge Hallak, can be read at: .13973.

The article Testicular pathology in fatal COVID-19: a descriptive autopsy study (DOI: 10.1111/andr.13073), by Amaro N. Duarte-Neto, Thiago A. Teixeira, Elia G. Caldini, Cristina T. Kanamura, Michele S. Gomes-Gouvêa, Angela BG dos Santos, Renata AA Monteiro, João RR Pinho, Thais Mauad, Luiz FF da Silva, Paulo HN Saldiva, Marisa Dolhnikoff, Katia RM Leite and Jorge Hallak, can be read at: https://onlinelibrary.

The article SARS-CoV-2 and its relationship with the genitourinary tract: Implications for male reproductive health in the context of the COVID-19 pandemic (DOI: 10.1111/andr.12896), by Jorge Hallak, Thiago A. Teixeira, Felipe S. Bernardes, Felipe Carneiro, Sergio AS Duarte, Juliana R. Pariz, Sandro C. Esteves, Esper Kallas and Paulo HN Saldiva, can be read at:

And the article Viral infections and implications for male reproductive health (DOI: 10.4103/aja.aja_82_20), by Thiago A Teixeira, Yasmin C Oliveira, Felipe S Bernardes, Esper G Kallas, Amaro N Duarte-Neto, Sandro C Esteves, Joël R Drevet and Jorge Hallak, can be read at:

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