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The father was HIV positive, which carries a significant social stigma in China and makes it almost impossible to have access to fertility treatment, even though a well-established technique known as “sperm washing” prevents the infection being passed to unborn children.

The IVF procedure would use a reliable process called sperm washing to remove the virus before insemination, so father-to-child transmission was not a concern.

An embryologist in He’s lab, Qin Jinzhou, confirmed to the AP that he did sperm washing and injected the gene editing tool in some of the pregnancy attempts.

But it has been slow to approve a technique called “sperm washing,” which has been around for decades and endorsed by other medical organizations.

The CDC has been slow to OK a technique called “sperm washing,” which has been around for decades.