Male fertility rates have been plummeting over the past half-century. An analysis from 1992 noted a steady decrease in sperm counts and quality since the 1940s. A more recent study found that male ...

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Testicular toxoplasmosis shows that parasites can invade human testes, but symptomatic disease is very rare. Studies to date that show defects in the sperm of infected men are too small to draw ...

An April 2025 study showed for the first time that “human sperm lose their heads upon direct contact” with the parasite. A common parasite can decapitate human sperm − with implications for ...

An April 2025 study showed for the first time that “human sperm lose their heads upon direct contact” with the parasite. A common parasite can decapitate human sperm − with implications for ...