https://www.newscientist.com/article/1837276-the-boy-whose-b...
> Around 0.5% of women consistently affirmed their status as virgins and did not use assisted reproductive technology, yet reported virgin births.
The article I linked reported that the white blood cell DNA of the child did not contain Y chromosome.
That's different than conducting a survey.
https://www.newscientist.com/article/1837276-the-boy-whose-b...