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That includes HIV, herpes, HPV, gonorrhea, chlamydia, trichomonas and, of course, Mgen.

Last week, they reported some modest progress: Studies have ruled out a number of agents known to cause mass mortality in birds, including Salmonella bacteria, several families of viruses, and Trichomonas parasites.

Giardia, a parasite that causes gut troubles in people, and Trichomonas vaginalis, a parasite that drives the sexually transmitted infection trichomoniasis, have just a vestige of the original organelle, a sac that does not perform the traditional energy-producing role.

The Centers for Disease Control and Prevention estimates that each year, 1.1 million Americans are infected with Trichomonas vaginalis, which causes the sexually transmitted disease trichomoniasis.

In particular, the bacterial infections gonorrhoea and chlamydia have been linked to an increase in the risk of developing prostate cancer, as has infection with the protozoan Trichomonas vaginalis.