Accumulating evidence suggests that a common single-celled parasite called Toxoplasma gondii may be a contributor to affecting male fertility. An April 2025 study published in the FEBS (Federation of European Biochemical Societies) Journal showed for the first time that "human sperm lose their heads upon direct contact" with the parasite.

Could this be affecting male fertility?

Joining me today to discuss this topic is William Sullivan, PhD. Dr Sullivan is a Professor of Microbiology and Immunology at Indiana University

A common parasite can decapitate human sperm − with implications for male fertility