Usually the first sign you've been infected with COVID-19 is a loss of taste or smell, a cough, or typical flu-like symptoms.
But for one unlucky man in Turkey, it was swelling in the testicles - and nothing else whatsoever.
The 49-year-old, who was otherwise healthy, went to hospital earlier this year after experiencing pain in his left groin and testicle that morning, which was getting worse as the day went on.
After realising he had a "suspicious contact history in [an] emergency department two days ago", they swabbed him for COVID-19 - and it came back positive.
After a couple of days' treatment the pain went away, and he didn't suffer any other symptoms from the virus, which has killed 1.35 million people worldwide and left an unknown number of others with long-term problems with breathing and fatigue.
"In its nature, the COVID-19 is a viral infection which predominantly attacks respiratory organs," doctors wrote in journal Urology Case Reports this week.
"However, as in our case, patients can exhibit various symptoms in organs other than the lungs, such as in genitals."
It took three weeks for the virus to be eliminated from his system before he could be released from hospital.
It's not the first case of COVID-19 affecting the genitals, but it is unique so far in that testicular pain was the only symptom.
In August, the American Journal of Emergency Medicine reported on a case in the US involving a 37-year-old with pain in both testes, but also "fevers, anorexia, myalgias, fatigue" and a dry cough.
And in April another case was reported in Italy. This man, 43, was suffering "uncontrollable testicular pain" and died three days later of 'irreversible cardiogenic shock' - his body couldn't pump enough blood to keep him alive.
"Patients with isolated genital symptoms such as testicular/spermatic cord pain and discomfort without other systemic symptoms should be closely followed for COVID-19 and clinicians should be alert for this unusual presentation of the virus during pandemic," the authors of the latest report said.
