Inclusion Criteria:  All men aged 18 to 45 having a sperm analysis done at the Fertilys fertility center in the last 2 years who have not contracted COVID-19, agreeing to participate in the study and having signed the consent form to participate in the study. All men aged 18 to 45 having a sperm analysis done at the Fertilys fertility center in the last 2 years) who have contracted COVID-19 within the last 6 months, agreeing to participating in the study and having signed the consent form to participate in the study. All men aged 18 to 45 years with a sperm concentration ≥ 15 million/mL, progressive motility ≥ 20% and a percentage of normal forms ≥ 2%.  Exclusion Criteria:  Men aged under 18 and over 45. Men who cannot produce a sperm sample by antegrade ejaculation. Men whose sperm concentration is <15 million/mL, progressive motility <20% and a percentage of normal forms <2%, determined following the production of a "reference" sperm sample, carried out before March 2020, i.e. before the COVID-19 pandemic.