Inclusion Criteria:  Army recruits and personnel who tested for SARS-CoV-2. Completion of a consent form. Willing to participate and to complete the testing day in Zürich.  Additional inclusion criteria solely for the voluntary spermiogram test:  Male No known abnormality of the reproductive system (e.g. Klinefelter-Syndrome)  Exclusion Criteria:  Unwilling to provide consent. Unable to attend the testing day in Zurich. A narrow-angle glaucoma or sensitivity to a component of the Tropicamide eye drops is not an exclusion criterion, but the eye examination will be performed without pharmacological mydriasis.