These were then sent off to the laboratory for testing for the most common STD in the world, Trichomonas vaginalis.

BBC: pipette and samples

Either way, it's too soon to make any changes in the testing or treatment of either prostate cancer or trichomonas, both experts say.

CNN: Prostate cancer linked to sexually transmitted disease

There is no strong indicator that an STD causes prostate cancer, and researchers suspect that trichomonas is just one inflammation-causing factor that may contribute to the cancer or make it grow faster.

CNN: Prostate cancer linked to sexually transmitted disease