Den historia du letar efter är " Systrar " av Greg Bear, som du hittar i "Tangents" (en novellsamling).
Det är en freaking awesome story!
Of the seven hundred adolescents in her high school training programs, Letitia Blakely was one of ten NGs -- possessors of natural, unaltered genomes. Everyone else was the proud bearer of juggled genes, PPCs or Pre-Planned Children, all lovely and stable [...]
och senare ...
It was not a plague.
Across the nation, two million children became ill. One million died.
Letitia read, without really absorbing the truth all at once, that it was the worst disaster in the history of the United States. Riots destroyed PPC centers. Women carrying PPC babies demanded abortions. The Rifkin Society became a political force of considerable influence.