Can COVID affect sperm count? What a recent infection can change

Yes, COVID-19 can be followed by changes in semen measurements, including sperm concentration, total count and motility. The important detail is that a change on a semen analysis is not the same as proof of permanent infertility.

If you had COVID recently and a semen result now looks different, the timing of the illness matters. Fever, inflammation and the wider effects of an acute infection can overlap with the months in which sperm develop. The useful question is not simply whether COVID can affect sperm, but whether a recent illness could be part of the explanation for this particular sample and whether the result needs review or repeating.

For the underlying measurements, start with our Complete Guide to Semen Analysis and the Complete Guide to Male Fertility.

What has research found?

A 2026 systematic review and meta-analysis of cohort studies reported lower sperm concentration, total sperm count, total and progressive motility in men after SARS-CoV-2 infection compared with controls. Earlier meta-analyses also reported lower semen volume, concentration, motility and morphology in infected groups.

These studies do not prove that every infection causes a clinically important fertility problem. The research includes different populations, illness severities, testing intervals and laboratory methods. Many studies are observational, so they cannot isolate COVID from every other influence such as fever, medication, age or the circumstances around testing.

The evidence is therefore most useful as context: recent COVID belongs in the history when interpreting a semen analysis, particularly when a result is unexpectedly lower than a previous sample.

Why can the timing of the test matter?

Sperm production takes weeks, followed by further maturation before sperm appear in an ejaculate. That means today's semen sample reflects events over the preceding months rather than only what happened this week.

A literature review of cohort studies found that the largest studies tended to show poorer semen parameters when testing took place within three months of COVID diagnosis, with less obvious differences when samples were analysed later in recovery. That pattern supports considering recent infection when deciding how much weight to place on one abnormal sample.

It does not mean everyone should automatically wait three or four months before seeking help. A markedly abnormal result, significant symptoms, fertility treatment timing or other risk factors may justify earlier clinical action. The point is to interpret the sample in context, not to delay necessary assessment.

Does COVID permanently reduce male fertility?

Current semen research does not establish that a typical COVID infection permanently reduces an individual's chance of fathering a pregnancy. Studies measure semen parameters more often than they measure long-term conception or live-birth outcomes.

Some changes appear to improve with recovery, but the evidence is heterogeneous and long-term outcomes remain less certain. A lower count or motility result after illness should therefore be treated as information to review, not as a permanent fertility verdict.

What if your semen analysis was done soon after COVID?

Tell the clinician or laboratory when you were unwell, whether you had a fever, and approximately when you recovered. Bring any earlier semen analyses so the pattern can be compared rather than judging one number in isolation.

If the sample is abnormal, ask whether the result needs repeating and what interval makes sense for your circumstances. The answer may depend on how abnormal the result is, whether this is your first test, how long you have been trying, your partner's circumstances and whether treatment decisions are time-sensitive.

Do not assume COVID explains every abnormal finding. Varicocele, hormonal factors, medication or testosterone use, previous testicular problems, genetic conditions, obstruction and other influences may still require assessment.

What if the result is normal?

A normal result after COVID is reassuring about the measurements made in that sample. You do not need extra male-fertility tests simply because you previously had COVID.

If pregnancy is taking longer than expected, a normal semen analysis still does not assess every step of conception. Review the wider Fertility Dance: ovulation and egg release, sperm, transport through the reproductive tract, fertilisation, the uterus and implantation, and early pregnancy maintenance.

Does vaccination damage sperm?

Concerns about COVID vaccination and male fertility have also been studied. Systematic reviews have not shown a consistent harmful effect of vaccination on semen parameters. Infection and vaccination should not be treated as interchangeable exposures when reading research.

If you have a specific medical question about vaccination, fertility treatment or your own health history, discuss it with the relevant clinician rather than changing vaccination or treatment decisions based on a social-media claim.

A practical checklist before a repeat semen test

• Keep the full previous report, including collection notes and units.
• Write down the date of COVID infection and any fever or significant illness.
• Record relevant medication, testosterone, anabolic steroid or supplement use.
• Follow the laboratory's abstinence and collection instructions for the repeat sample.
• Ask what decision the repeat result will change.

ProFertility's current semen-analysis guidance uses a 2–5 day abstinence window unless your laboratory gives different instructions. Consistency between samples can make comparison more useful.

When should you seek specialist review rather than simply repeat?

Do not let a theory about recent COVID postpone assessment of a severe or clinically important finding. If no sperm are seen, the count is very low, there is testicular pain or swelling, a lump, previous cancer treatment, relevant surgery, testosterone or steroid exposure, or another significant history, ask what specialist assessment is needed.

Likewise, if you are already preparing for IVF or ICSI, tell the treating clinic about the recent infection and semen result. They can decide whether repeat testing, sperm storage or a male-fertility review would change the treatment plan.

The useful takeaway

COVID can temporarily affect semen measurements in some men, especially when testing is close to the infection. That makes recent illness part of the interpretation, not a diagnosis of permanent infertility.

Read our Complete Guide to Semen Analysis for each parameter, then the Complete Guide to Male Fertility for the wider assessment pathway. If you want help interpreting an existing report or deciding what question to investigate next, a fertility consultation can review the result in context.

Sources

• Gholami Barzoki M, et al. The Impact of SARS-CoV-2 on Male Infertility: A Systematic Review and Meta-Analysis of Cohort Studies. Reviews in Medical Virology. 2026.
• Effect of SARS-CoV-2 on semen parameters: a meta-analysis of 39 articles from 15 countries. 2024.
• Semen parameters after SARS-CoV-2 infection: a literature review. 2022.
• SARS-CoV-2 Vaccine Effects on Semen Parameters: A Systematic Review and Meta-Analysis. 2023.

Sources checked 12 October 2026. General educational information; individual semen results need interpretation in their clinical context.