A test showing if sperm can break through an egg can guide fertility therapy

An experimental test could identify cases of male infertility caused by genetic abnormalities that interfere with the ability of sperm to break into an egg.

Figures from the World Health Organization suggest that 1 in 6 people worldwide are affected by infertility at some point in their lives, with the cause often unknown.

When investigating male infertility, doctors assess sperm volume, number, shape, and motility. If all these factors return “to normal”, the…