A significant global public health concern has emerged following the discovery that an asymptomatic sperm donor, known by the alias Kjeld, was used to conceive nearly 200 children worldwide despite carrying a genetic mutation that significantly increases cancer risk.

Denmark’s public broadcaster, DR , brought the crisis to light. “At least 197 children were born thanks to the sperm of an anonymous Danish donor using the alias Kjeld before the sperm bank discovered a serious genetic abnormality," it said.

The scale of the situation is staggering, as the donor’s sperm was distributed between 2006 and 2022, sold to 67 clinics across 14 countries. In Denmark alone, 99 children were fathered by this donor.

The Danish Patient Safety Authority confirmed this distribution, noting that 99

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