One critical aspect of the plagues, though, was quickly refilling
earth’s population. The Horvath had hidden a subtle genetic change in
several of the viruses that were spread. The change had to do with
female reproduction, especially in the “blonde” genetic subgroup. Women
who were effected, and the spread had been very nearly one hundred
percent, were subject to a “heat” cycle similar to male reproductive
drive and pharmaceutical contraceptives were functionally useless. The
Horvath had anticipated their plagues essentially depopulating the
planet and wanted to ensure a steady supply of new human slaves.
Friendly Glatun medical AIs and doctors had stopped the plague from
killing most of humanity but since most of the world’s population was
infected by the orbitally distributed plagues, they were left with the
problem of what was called “Johannsen’s Syndrome.” The only way to fix
the global issue was a reverse plague. But not only were the ethical
considerations against infecting people without their consent, to stop
the Horvath plagues they’d immunized most of humanity with advanced
nano-bots that stopped virtually any biological or nannite in its
tracks. To undue the damage required multiple medical visits and
advanced technology that, at that point, was fairly rare.
This left virtually every woman on the planet with so much as a trace of
blonde gene as a baby factory. The first year after the plague, Germany
had one birth for every reproductive aged female. Scandinavia at one
point hit an average birth rate of 9.1, meaning that if the rate
continued the average Scandinavian—Dane, Swedish and Norwegian—woman
would bear nine children in her life. The teen pregnancy rate got
completely out of control for about five years before education and
cultural effects started to get a handle on the new reality.
It was all very well to say “be fruitful and multiply.” Johannsen’s made
the situation simply insane. The nature of the plague meant that, in
some cases, there were serial pregnancies meaning that more than one
viable fetus was in the womb from multiple inseminations. Some women had
three children in as many months.
There's more of this satirical Swiftian takedown here.